Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a67fbf44dd6ced…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 13:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abfa1bd4cf372b17afc55804b3dbd984 SHA-1: 250394f3c4b9e50d7e58ad9d19d8e49a237cd2d1 SHA-256: a7a67fbf44dd6ced1d2a7c203c49d0ce9bc34a13724611156a6237aa4a803e1c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is unreadable, but the heuristic firings strongly suggest a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://zeguvietnam.com/uploads/ckfinder/files/vesutisu.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0ca6f0c0b3dc1fb42479978cf4ec422d/rivabadawevu.pdf
    • http://gramercy-grand.ru/files/file/65921519700.pdf
    • http://ei-windykacja.pl/upload/file/gawoxasiwe.pdf
    • http://mulroyenvironmental.ie/userfiles/file/92635332362.pdf
    • http://acecaalcoy.com/userfiles/file/96241451187.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510e281225---tadajonoxujimi.pdf
    • http://ride.hu/images/uploads/files/60300045332.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a69df979496---54049141136.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c9e5a5a93599dfe7722e3c6cf648ba6a/xefusajovo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f50d8c25a---wibisowevinoputogejukajux.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dddaa43ff---79482078422.pdf
    • http://guides2alpes.fr/uploads/file/80697980242.pdf
    • http://maynenkhiinverter.com/media/ftp/file/mazuxeroraxig.pdf
    • http://dok-vo.ru/userfiles/file/pavaxejomabidu.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/048af68bfbed9918433a4d986f252c68/nupofidumuzemufuzinazop.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ff04a07b7---lajaxubikesinupitiwevaguv.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfbituc3kgg3s93n05gf5jtosc/84854823401.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/o6r38os6htl7kn6ap2qficlfn2/39468486872.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6881843de---bizipafuvenewaxozoda.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab9b4e194---baber.pdf
    • http://bajajsports.com/userfiles/file/26237843827.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3a69b65a---7542203737.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb205a931f---doxidejaje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=being+forgetful+meaning
    • 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_off0000ec86.bin
d295cf9c3e2e6cc1ab543a4367a609e906092627aed8ee8fef82855543330053
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 17656 bytes
font_01_sfnt_off00011ad5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
font_02_sfnt_off000132ec.bin
2572cbf7489fffe357a00b6034e353ce1cadf41e740e23ba3faeca39d47069a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 10540 bytes