Malicious PDF — malware analysis report

Static analysis result for SHA-256 873530826ad73f92…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 16:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe60246057909e64fdbb11dcf8a7fcb9 SHA-1: 515aab2a630a7d57e9a797170a71355cf0d29abb SHA-256: 873530826ad73f9242afb90b1b9da52ffb4be0b8ad26361f4e3719d9234d892d
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number for a fraudulent callback scheme, consistent with tech support scams or billing fraud. The numerous embedded URLs, many hosted on compromised or disposable domains, suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bienenaktuell.com/sites/bienenaktuell.com/files/file/gamelikuravonamuk.pdf In PDF document text
    • http://lactopad.com/uploads/files/34445468771.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/titane.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/budilovijet.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/ko8u1fbho97cacs3njo1p0kka7/54922024717.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/16350165014.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/kofafes.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160854f4076c91---37634619132.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/69242550891.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/rumefatorubeva.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bikivuxedil.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/uua4s5ji1fgc1pkrev3civuts2/vudulaj.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/ninogofikudogosi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160970d3075b80---wivegavujoze.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/gunukegi.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/xobijimedezusulinagid.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b90ae75a4f0548ae70aca5467919db57/23333910025.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/36976611156.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/sekiwose.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/zenovawikabitodaju.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kuska1uo7pu1pf4q6jiko45uch/zatuwenitukel.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/jexej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+do+you+use+to+brew+potions+in+minecraftPDF 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_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11272 bytes
SHA-256: 1ae94cf181a8c0a0dac5b8de938821e8636725230d95ad9bf18788e05603c5ee
font_02_sfnt_off00012244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12244 18596 bytes
SHA-256: 9b975206f0cc9cf08d62add54f8bef8d461ded46d68143571d42914d3d68131d

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