Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6af96410dbaf5c…

MALICIOUS

PDF

92.0 KB Created: 2021-07-22 17:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0de5ec748fe65a34ca40e7189836400b SHA-1: e389e22f010b84b5fb9be1da38205e6d65d81998 SHA-256: bf6af96410dbaf5c056822db89565c5e1bea1436a24a9d2cae466526e356fc04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised or disposable. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/76039954959.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/98767130641.pdf
    • http://10glazsikeyrosa.ru/file/62530479792.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ssim61sp3qm84d6g3l9nghmd61/14949190294.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b548546799b---28429862594.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ph78nd0e7e5aqe04892maenbg1/kusilozepilivawipimekubo.pdf
    • http://thaide.org/userfiles/file/wegutobebajefil.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/954aa3f4a10470220716fda3b9c4febf/piripesuwalutikaxujepez.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7562cacfdd---desufazosa.pdf
    • https://securityguardsupply.org/php/uploads/file/2664037312.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7857744739---nijudonek.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bfd779918bd3812777160341bf62a2f1/gubilonapexavegov.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dee84c3b7---32130729026.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8279b1941fec906174900184c951a4b9/gopotabokopir.pdf
    • http://signauction.net/userfiles/file/52136613997.pdf
    • https://pindimana.in/uploads/file/97542632374.pdf
    • https://cometsecurity.in/admin/userfiles/file/76977875236.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607433fdca70d---53870540629.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96966b950---25814880977.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe655ba41---majusekovujow.pdf
    • http://sakurahoaanhdao.com/webroot/img/files/31405008805.pdf
    • http://akcjonariusz.com/UserFiles/file/govorawotefebopapewafe.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4e592262e43c8effb49f7b0eb94a0f03/24294278915.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jane+eyre+in+the+attic
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106df.bin
3a1986b80cc1e56acf2085dbabffc193f892faa7e990e56e50697bb573f413cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 17604 bytes
font_01_sfnt_off00013404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13404 16792 bytes
font_02_sfnt_off00014c1b.bin
bba11e1def9dde4a09539e41345d777e6f0c6a91e127a6663bfc1e7cc417fd2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1B 10100 bytes