Malicious PDF — malware analysis report

Static analysis result for SHA-256 517a80e7eaa1cce0…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 07:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad38704c4230741207fadabb3685ebe5 SHA-1: 548be351e63c4483185ab02918d20a067944ea58 SHA-256: 517a80e7eaa1cce018baa03ab2d807d7b54ce125b897ccf695d45087c3b84ad3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic firings strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=score+sheet+futsal+pdf PDF link annotation
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/71173558847.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/86101812665.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7f06ca6---94075167388.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/jatorad.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/89826190487.pdfIn PDF document text
    • http://abnicum.com/files/file/kafokejozim.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/29516766454.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/l48r85krnsj11ekd7e2ttuft26/22988153999.pdfIn PDF document text
    • https://themalc.org/files/file/19852854634.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608365b5aa6e2---walawodogi.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/xukivo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zuvujexidozunafanatu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/begitawoxanivalixikos.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108161314473072.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097186cabe23---taluro.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/614df15255150351b7d17e909a960106/83839437168.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/35858326746.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/33322307690.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/gekowit.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/demodorupotolob.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/3418876059.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7illeq9ga3bh991jalikbho826/55970796433.pdfIn PDF document text
    • http://abwrva.com/uploads/files/85938773041.pdfIn PDF document text
    • http://recviem.ru/img/upload/37188900560.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/16159488369.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/44203547717.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_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 17460 bytes
SHA-256: 2873fe415d6f82cd57d2969a155e0c8b3aa8074268aca6912ad61defd91c05e3
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10696 bytes
SHA-256: 0be942463ca310c30add72f7da87d1472fd95cbc2f1eadc5a97209fcea2da7a1

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