Malicious PDF — malware analysis report

Static analysis result for SHA-256 437d90aac040da8d…

MALICIOUS

PDF

94.6 KB Created: 2021-06-21 15:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e1724d0824110fa41e5dc8e953ebfa3 SHA-1: 5da8498657e9f16613b84c80288a7053742a0535 SHA-256: 437d90aac040da8dc490f6cbc50bfbaed5191ee578224e1bce03ad81267d5e7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://paoladebenedetti.eu/userfiles/files/18893658629.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/078dfeb846c6d8518f497fd02420a2b3/wozalotoxelesukona.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/lefovoruwagav.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/simun.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/53df41b237305ec153baa03027229f4e/malevetidezopivufoxujum.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cff16fb8e---zadobemaribuvuxafifo.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/2303321530.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/kolerajeb.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4d37db6a---9894050965.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a7179e1b1fcb0612db15ef6fd3cb3e1f/50693456744.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d3d65bb18bcf60ea0626a678b45f0d6f/vatinuwugepefawi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d56d592f70672faa0145b259390b6031/86122916292.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/b4k866sms5ji8hj367amilbob6/29343504656.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0250cd6592---30753339825.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160abab58d0fb3---zeruvuripirefar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bakthi+padal+ammanPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 5036 bytes
SHA-256: b0ac5c26b6e82203310102d13261a3039d2c9c7fb9a597b21a962c16811a8705
font_01_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 17536 bytes
SHA-256: 47d5189fcf96e6b38fca55f1191c862a50cafcea8b04b4bd25999ab325160ddf
font_02_sfnt_off000146c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C1 11524 bytes
SHA-256: 3105b21cda70705685e8060e6060b927de88ae932de630692d6d59e2ce8bf1b0