Malicious PDF — malware analysis report

Static analysis result for SHA-256 818c37895283e052…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 23:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84752d0a571f4bb0c0ae1b7e695404ce SHA-1: bcd259a49006f05c41aed756de595c6a1b5a4e9d SHA-256: 818c37895283e0522943ac2cb9ee9aab38a9a156cd79e8648b8833f836a56a7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://4els.ru/uploads/images/files/robomufekeke.pdf In PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tfjb00bl0iur9uovolaq7apq13/64815317828.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/betiju.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf47c17e6a6---87083910597.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3o1lu354dnvd71pt9rdt3u77c9/27002586063.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b58d1a1f---funoxoponerov.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/54974948272.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/bojuwakivawejoxosix.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c20a39ee---lowezesejonikasafovu.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/demukexomeguxejomuvamipa.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/zujogazusadeve.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/48536058192.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/60703803854.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4vicgrmk41e1truv8foqgkel3r/30436892110.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/17804764725.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1fb4b213d5050764c9d5cf80db194e15/xidipagegebexibuxujog.pdfIn PDF document text
    • http://bushurov.ru/images/files/fewoxozo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dc66a46e---pozejelosukotuveneti.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d28540d38ec6201beb5012b6282bf3a1/42331797234.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/58407216442.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/39348114060.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/6853699725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sample+of+memorandum+of+agreement+pdfPDF 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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 10756 bytes
SHA-256: 005ca0853108da4b63f918ad0b08ec7f1b8ce8fa46570d6512e2890f3426c5c6
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 17944 bytes
SHA-256: 021bbd2cffae7c5c9db08232c4d290a2149b7d56156a76f74360ae8e2de6aac9
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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