Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81f88e021595029…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 03:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0b786dc8e602584c40d78ee4580b77c SHA-1: e5678139f6438541162aa050d32792d406696fd3 SHA-256: c81f88e021595029c709a597afae73e7b74a7c4a3d2a300b5705f54249ee9634
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a callback phishing lure, instructing the user to call a phone number in a context related to billing or security, consistent with tech-support scams. While no scripts were explicitly extracted, the ML classifier strongly flagged the PDF as malicious, and numerous URLs point to compromised WordPress sites, suggesting a link farm designed to host malicious content or redirect users. The document's structure and embedded URLs indicate it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/05vtua1bdl85k7lm051bumbc7v/selasoruditovekakike.pdf In PDF document text
    • http://thewesternmist.com/userfiles/file/mezetazoxewiraf.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/kufarif.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/musulabofanomipadozam.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6cb538900---tefivoxememevalazil.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/57199590108.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/zanojuwiv.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0s8ihmvgqh8s09nkgpp555v0f9/zaloludebup.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/dudibeguda.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/62012965741.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/21757288457.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909112553.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/82997949112.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/81060361066.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/33056144511.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/93757e933bf0ff77b689b3d8ea249d09/bajevelisin.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/nisosijoxubav.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/98007312287.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/pepigunovofeme.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/lisamefaxuxopadi.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/42546097279.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/fofimijopukinijuzop.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109230651276966.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7abd7089385d8ce536c61d627817ade/jiwupinugilodijatimiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=her+watch+online+123moviesPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 18348 bytes
SHA-256: 192cb3a8aa81f90f16b63e8327682afc581c51303445d72dc4a66991a50fb320
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 10984 bytes
SHA-256: b4d00010bd62210e748ab29a5642548b4449b3ae7c46ee228d2c4367fac366b7

Open this report in the interactive analyzer, or submit your own file for analysis.