Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab51644a7cb22a67…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd53cea67722549930a33dad3f2ce140 SHA-1: 39e805c88fc9a36467ae50e252844de42abe0d33 SHA-256: ab51644a7cb22a67f93857e63d8f14b7cb891131f2bb31e18d020a94966fd62f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=heavy+gunner+3d+apk PDF link annotation
    • http://oralrem.kz/ckfinder/userfiles/files/37741237134.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7tugmc9rg9jlgelsk6uq6d9082/65121079253.pdfIn PDF document text
    • https://haidangpc.com/contents/files/98091531134.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/9958054780.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mewexelosevevoruwagaxije.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/susutemowavovitopil.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/lasasuk.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/4854807297.pdfIn PDF document text
    • http://mextro.de/upload/files/davolizukanaromovaregiso.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/89909080563.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/35260934883.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/vizima.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/somuneposotugiwazewe.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fecca2eb346941a9ce8ddca3d750da39/80268106950.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/dijoxemokupovavede.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02de3392f---98836890454.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/69249372982.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/78341548822.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4860b69ad14f837da6db4d4c4db12697/65149735793.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/bukubevosulevabiga.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109072304288229.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/19389285371.pdfIn PDF document text
    • http://ahchala.com/img/file/xiragojozix.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/padalaxa.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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 19952 bytes
SHA-256: c227ddebc6458c6f5e3a94841823503061407ec215e7d044121280e69344f3b0
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 10576 bytes
SHA-256: 1a4cc5ccae28020d0768773e04c009b55bbce3800d5210428a06463dd162a95b

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