PDF malware analysis — malicious · 55e8800362b9f2c6

MALICIOUS

PDF

85.7 KB Created: 2021-08-08 20:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d78d252cf78eaea862dcfa9bb60ad24d SHA-1: 4cca786950ca3c59b76e8cc67cb62b4ce7106fd3 SHA-256: 55e8800362b9f2c6216162396c6bfb5687a7d76bd51dde966cecf25e103d80e3

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that exhibits characteristics of a callback phishing lure, as indicated by the SE_CALLBACK_LURE heuristic. It also contains numerous links to potentially compromised WordPress sites, suggesting it's part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities to deliver a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9903

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9371369a8---65726388909.pdf In PDF document text
- https://area34.info/wp-content/plugins/super-forms/uploads/php/files/augdlam8iu0tdlosc9n547l7n3/sexaduzabezo.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fd0fe38ea9b4a54a1824acfb28df4a25/jupopinan.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fad02532c---18231945056.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9dd94875---gikasesa.pdfIn PDF document text
- https://nhatngudongkinh.com/upload/ckupload/files/98218774431.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b238ad0224---81247980764.pdfIn PDF document text
- http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/62099581607.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d6c32527f19266b1b6d6bfb518b7f06/57249525130.pdfIn PDF document text
- http://amoy-art.com/Upload/file/36665894037.pdfIn PDF document text
- http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/140955398758.pdfIn PDF document text
- http://e-kva.ru/admin/ckfinder/userfiles/files/kidazifomukuwigiso.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd8d67eda---kevemepotipuvigafalali.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608320aec6dbb---tobowawejirekawelakanak.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/69d6261103f59b6cd61ef34e3826c9d7/dekoru.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960bf207ad3---xejurotanabewelenudu.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0mc4i8rcs52g002c1gunm573tf/25013352354.pdfIn PDF document text
- http://ordinate-ltd.com/file_media/file_image/file/5245585326.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/afebd21119ab84afb5ce1afc18893b04/lijajazixux.pdfIn PDF document text
- http://swissies.lt/ckfinder/userfiles/files/93180010449.pdfIn PDF document text
- http://allamericannursing.com/userfiles/file/50957360615.pdfIn PDF document text
- https://albawadiroad.com/userfiles/files/xisapazitunususeluju.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870089c891b---pituzafuzivakiwagokokopek.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c2a1c55c3---nuxujuxotedenugevadiwi.pdfIn PDF document text
- http://monkey-do.net/userfiles/file/sazodepusejusosejexel.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2f97b91a---25880422919.pdfIn PDF document text
- https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ad785a9018c2b9420b5f943f60635929/rijozuxoruzijavi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+get+a+copy+of+honorable+discharge+papersPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA26	11228 bytes
SHA-256: `83a048ab7caff8ab0d8b89efcef3cc9f69a85e3adcd3c7d82e94c4bf5fb65f97`
`font_01_sfnt_off000103fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103FC	16684 bytes
SHA-256: `ef88c07be31d1810ee9c5b7b9ed0842464d1c8798ef04f1e57e9c75d2906433b`
`font_02_sfnt_off00012f48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F48	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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