Malicious PDF — malware analysis report

Static analysis result for SHA-256 6155746d12970934…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 03:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 417323b786dfe7b51d9839040796ccd3 SHA-1: 13d475f308fefd8ff74a536d4b3ec834edce9ece SHA-256: 6155746d129709344f902249941360741b8b23d9f7ba4977aca628ddd7d276ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. The presence of numerous external links, many hosted on disposable or compromised domains, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://realxenon.ru/uploads/files/pamedis.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec82f636ff5cd310d73fc6ffc2c2eb27/kenodava.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/17043028091.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109070244138645.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/2602291249.pdfIn PDF document text
    • http://sayarbobinaj.com/file/14400743783.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/71895762938.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/37281387965.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/6941065913.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/ripekazeperaruteveram.pdfIn PDF document text
    • http://skupka54.ru/upload/m/rejokofenijo.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/gumexamegizitijotamafoni.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_043258_159.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/89824826485.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/rekom.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7869cf675---16704658704.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/7079280303.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613835adc4566---lujiwopeluweni.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/38419077934.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/wabinofisuvireguseva.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///fotunijowubemu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ae167899---80811518614.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/sotemufenoju.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/fuxevopowa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72895570165.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/54320449996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=minigun+cheat+in+gta+san+andreasPDF 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_off0000c26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26C 19884 bytes
SHA-256: 41ac66f519f01ce731d085896e77fad69e55df12143df7c45a116dbdcc3b7650
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 10576 bytes
SHA-256: 628774b044fc366d1a6c89ff29d95863108263d6741c3263f6fbb0a76b5737df
font_02_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1