PDF malware analysis — malicious · f37b627bb90c0e41

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 15:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: e477099451b69be2790044891cb29a6b SHA-1: 952c24ea5eed7a6280280793d344f58addb1eee3 SHA-256: f37b627bb90c0e4173e7fbb52d90cf64c11047ca9abcb685a31b146c9c58ac67

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites, as evidenced by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

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.
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 http://inezorviskids.com/clients/37546/File/14108169385.pdf In PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a777e6545fc---16323405033.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09186cf05e---57225474445.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce9a69456---75032799862.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e2d9ac4eda75eb5fb432a209819c161c/wevedifikizajol.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8025a546---14356315470.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8b288ead57f0eaeb0f0274ab54c7492c/53704500173.pdfIn PDF document text
- http://prime-standard.com/piceditor/file/bumifesaxuv.pdfIn PDF document text
- https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c8ce2fb699df291debf9ea8ccf748a01/matuvovamekafaxafu.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b671f12ea---22244358988.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/nexigirulabifufunim.pdfIn PDF document text
- https://jetaime-shop.com/files/12631434914.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c5882d12027---44092454732.pdfIn PDF document text
- http://longthinhphat.net/uploads/files/woputazumegadupidonabi.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813be00afae---83353127267.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/29621348491.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1a2dceed---63981969010.pdfIn PDF document text
- http://abwcoliseum.com/uploads/files/88612060784.pdfIn PDF document text
- http://ajisushionline.com/uploads/files/91577971225.pdfIn PDF document text
- http://teplospectr.ru/images/files/gemariwunota.pdfIn PDF document text
- http://boothbayharborshipyard.com/userfiles/file/jubeto.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i1icl9k94715magdqe9u33j3a1/rimino.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab78e2292---32727364440.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ecb54913---93765023383.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a10a11bfb---vudononozuw.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=d+and+f+block+elements+important+questions+and+answers+pdfPDF 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_off0000f786.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF786	17292 bytes
SHA-256: `8645c321753399437627be208631c80279c429a97cd4180911bc1dc29c6ca99f`
`font_01_sfnt_off000124b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124B5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013ccc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CCC	11348 bytes
SHA-256: `c477d085c9c8e9df28a62c8d19579d8e71fe05674921ba9a1216ff35cb3a6cb9`

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