Malicious PDF — malware analysis report

Static analysis result for SHA-256 da65b4be5724517c…

MALICIOUS

PDF

155.5 KB Created: 2021-07-25 17:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd6041fc90ac3f0f2483edfc6854d417 SHA-1: 210c49ad0ce4e5e8326db5fa37b6504d00562661 SHA-256: da65b4be5724517cd3929364c5c5a7dd6f6cceefcce8894f4f197c5a2687e944
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous compromised websites, likely designed to host or redirect to malicious payloads. The presence of external URIs and a link farm suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5194

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kle9r5ueg6vr713c7ab2u6b6nn/nugokepitijofenod.pdf In PDF document text
    • https://vegas-shop.net/uploads/files/zesenenovu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0ff7a89ad364be5efe002c0fe1e0b848/jawilorewenup.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddd50c8943---misipirolikisosal.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/3861687647.pdfIn PDF document text
    • https://harom.ro/files/file/5327915413.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/zopogobajuxefofenadumu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32caf58781---komadutodufuzorufaduvonuw.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/51fcfaca88f3b5839c4c72b8257b3861/46300366829.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6a53d30f26b16e657c89f56aaad546d/lubivibokunox.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3fc04b6ab---lesifoze.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb165939c04---veropop.pdfIn PDF document text
    • https://ecoretras.com/file/73374015059.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff57508b5b---36752748195.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/midex.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2aa940ed---danusu.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0bb102ac---kadobeso.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5a0365f6a2429da98bbbdef53be87983/21975932250.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2a67fa57---86630093006.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jqriqsrqq0hvdcu7s5m7d2213/57364397395.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/97534614654.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/panufixokawigu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebeb862923---zifisulawajirefe.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/35753115180.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3551e4119---penopisagotijadulunataz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=elementary+anecdotal+record+sample+depedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BB3 10680 bytes
SHA-256: a3058e85dadbc820c4d67a360e8d5e3ce13262e71ec62dd93cf3a12fd8424f85
font_01_sfnt_off0002343a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2343A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1