Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e23e3da98bb25e8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 15:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8117074cdeda2cff69fd073d0aa561b6 SHA-1: 134309f1fe16e054d8ad9e90829cec94981c04c6 SHA-256: 9e23e3da98bb25e8eb37191b71ae9c9b5ca5253bc5035527313327915412ad9f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing structural elements indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://garglob.ru/uplcv?utm_term=xiaomi+poco+x3+nfc+price+in+pakistan PDF link annotation
    • http://chayka-svg.ru/files/39172945745.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/xapaf.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/lasekulikagabodavodadadi.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wemeven.pdfIn PDF document text
    • http://full814.com/upload/files/29859242759.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/29116559820.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55ca2f1a---10116009601.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6140588100.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/71227902783.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/megefitanuxesizu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ku27nuh2d3vinlc5hop3ci052k/xizexefexazuvanusetuzod.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/niwarorowit.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/bisutegamurapivotiraler.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7290f67cbc99f635321b565b4237a09f/duzadesuzavozeturutid.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/89179640923.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/74922766071.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/fululasizatotakefipijo.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/25727758514.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109100054036092.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/sotebutepewo.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/59177479186.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/89910201071.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/resitudufudu.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/fewajolarurifezo.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/48789011311.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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10968 bytes
SHA-256: 629c1f3e88a22139d085cb4f843fc4d59794662ffa935cc80209edcf659a3a05
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 19216 bytes
SHA-256: 102e88fcd7d794c0904b5cebdc77c65fcec1e5c11f449d21e6f59ca8bd745507

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