Malicious PDF — malware analysis report

Static analysis result for SHA-256 37107bbb5476731a…

MALICIOUS

PDF

93.6 KB Created: 2021-07-31 05:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 34a0d31c10844a1d4d2d2f6801291921 SHA-1: 21483f71e8ae07dcfe551ad4a5302b28b641881f SHA-256: 37107bbb5476731a140abb608f8668ea3da181c9626832d41537ee3bb6b307f4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous URLs pointing to compromised CMS upload directories suggests an attempt to host malicious content or redirect users. No scripts were extracted, but the PDF structure and heuristics point towards a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn3aq8smn1tj1gv7vfn5anh4h3/96486940860.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/985a930c6e0d7e67e9a2a2d424cdd1a3/42768276797.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/givewebavamamu.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/11181809538.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c68973c27---72206048036.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/20698735116.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/04bd45032130c80206fbc41706a2701f/kezaxabefusejo.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608177ca16645---sabebobedefezi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/6228061863.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/23835a64bebf9245d4c0d29363ba9201/87223280572.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/guzaw.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b9dab926bb71e1fad94f92351fcd2f6d/8946318464.pdfIn PDF document text
    • http://turatabor.hu/media/19651010688.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/omvvonngn09vaak75j8vrg60a5/70902516459.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/fisoxabikinexezegisoju.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/10809164736.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/77633876645.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/17232629231.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/jubekebogifokejisek.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/c28h3l8ec6se3542n79eiti7d2/vomapix.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/57155140024.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bee6ed87a57d99ce56a222db3789718b/vujov.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23436dd68---215713977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+long+does+the+nitecore+i2+take+to+chargePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3369df96fe7b198b7c88ca448f7a3012/nirufa.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cd51295206eb0c0af913d452c306e598/76924992649.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.

FilenameKindSourceSize
font_00_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10936 bytes
SHA-256: d6bed43baacdfc43d5b04970b429601020d5a3d0a9bb3d1c7d825d7e8b50f6d6
font_01_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 18624 bytes
SHA-256: 1437287c9bec5852752fb61894e91b58ee21a394b89873dea78460b0828ec1f5
font_02_sfnt_off00015048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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