Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85c796496d0d8a2…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 11:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e9b286efcaf20da16077e0d67890960 SHA-1: 7bfee052adab8fb501086ab2b61de8d269a10b78 SHA-256: b85c796496d0d8a258f6e9103316caa4a7aedb4e21464ec3c9e5fba77a41eb22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://garglob.ru/uplcv?utm_term=caught+by+surprise
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ba2ed281---degofoxezizigugegula.pdf
    • http://aarogyamedico.com/userfiles/file/jesudoxuxijobelofobu.pdf
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/47681378800.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e0d1522d---jekojomabosida.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/31442436434.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b701be2caa6c4f230036d64546bff724/91244714619.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e70737cd1---rijitexigunozabasa.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160815d7b8a515---vunaxebemadosov.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/komifadozojuz.pdf
    • https://genegurumiraclehealer.com/userfiles/file/semikexaxapajesematom.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd61ccc12d2---89681491785.pdf
    • http://webbuilders.com/files/file/furusivumeku.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hj3oma061nli4lfvosf1f8oe72/1979913914.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086e7b875b76---ximijebiwozorijolarufabam.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b9dd0b1f9241da63624a574353e255f7/49042436555.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f3828d5c---losikugefapajoja.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/u55th14ciknge02kfraguhod47/39929931110.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tb6jv9g97arp863jn23suhp347/wifelujasufokewurejokul.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/94c260f03282cd7b19515154e024a544/kenisebodalukibemego.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67314d1f76---92188845698.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rr79bc7mcjan2c8og7p3ur9r4m/89402134836.pdf
    • http://mid-europe-ex.com/images/blog//file/39951914763.pdf
    • http://ibb-online.ru/f/file/38854314625.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/272bbcd0bf3eadbf4fb4d1d76e9b76b8/nafitemerilokifuzamavupez.pdf
    • 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_off0000ecf1.bin
1907b617a609454fa5078aad4ce162b96ff0b193928714b22659ae14d833d6c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 16868 bytes
font_01_sfnt_off000118c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
font_02_sfnt_off000130da.bin
2bdc2a57ee74c70b17226fa6624bfa7621df1a6530fa77dc965569a1e52c3158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 10644 bytes

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