PDF malware analysis — malicious · 595871996a2a9bf9

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 02:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 052477f0d4d86fdc21c4185f78262d10 SHA-1: d1d30e490c09651bc9f5b48583000c8a23e8339c SHA-256: 595871996a2a9bf983cabf9a476124208bcfcafcfd4aab15de14bc2b8ac85c21

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, further indicating a malicious intent to conceal its true purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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://crewmak.ru/uplcv?utm_term=how+to+make+okra+water+for+weight+loss PDF link annotation
- https://dienlanhbachkhoa.info/upload/files/92820478149.pdfIn PDF document text
- http://coming-c.com/userfiles/file/96132939399.pdfIn PDF document text
- https://tuttoadomiciliocn.it/file/61770683706.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e35e4482249ee548268a2c6267407fc0/5982102858.pdfIn PDF document text
- https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbef1bc6839---2218614871.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b3c063802---55862597021.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/78430308814.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d3b0ee7d---luterimupenos.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/142fbil81hn4nv1louudgpiq9m/36098003755.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c948f489b19---lejadegawojixip.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71edc18ea---mosawetunanutero.pdfIn PDF document text
- http://tele-video.ru/upload/files/gurobemonowotomimegatoge.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e822baae09---vugagebevivu.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28373229015e310a1ef77352a2e5ad9b/94357511960.pdfIn PDF document text
- https://bimetoor.com/basefile/bimetoorir/files/buveravuxakinetosokipe.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/k487fc7ltfoasprgvop2i7mds7/60324311353.pdfIn PDF document text
- https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/aaa68d4ccd2a4ae06985e7e9e7b13aa5/66218666913.pdfIn PDF document text
- http://palyavalaszto.hu/teszt/upload/file/79134994734.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160da4509d540a---84117702375.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ac2c9cd2d084575665f366993613d222/18979751961.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aac30041f---kenotidajute.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5346ee000---82588144575.pdfIn PDF document text
- https://pypconsultores.mx/userfiles/file/97750686162.pdfIn PDF document text
- https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/5460cd6f37bd6cba496d0dcb4e836b93/95232628497.pdfIn PDF document text
- http://allprintusa.com/admin/images/file/8548765565.pdfIn PDF document text
- https://gannat-ltd.com/userfiles/file/50302282715.pdfIn PDF document text
- 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_off0000ef22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF22	10724 bytes
SHA-256: `ec9a33dea1b6692b9e67c3aa93244b5dd7b3dde77206e6170bd84d4296c30b61`
`font_01_sfnt_off000107c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C3	16832 bytes
SHA-256: `b4bee8eb78a96f9e115ffecd4eff0cdf23e306bd39750ecd678c493c15eb7981`
`font_02_sfnt_off000133ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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