Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f14d68c1dd990a5…

MALICIOUS

PDF

75.8 KB Created: 2021-05-29 05:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9589cb621f8b7cafeabe95918d20d288 SHA-1: c34cb819d4dbf0f0038a04eed29848e9933d14f1 SHA-256: 7f14d68c1dd990a531a3f39d8df5c1e87dbf389be1660e07ae8aec7c06202d2d
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 0.9998

Heuristics 6

  • 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
  • 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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/j34kl7m26cboklrr2jcc65741m/gasuwavaserigixeresopuwol.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-17/20210517225653479231.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gudasabunagosodu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/7244391621.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/fatudorafo.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/zimunasodexesuribura.pdfIn PDF document text
    • https://yuss.it/file/23516844115.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426fdcfc45---razokirubojofojovukikokop.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f019f1a0ef---xewalenamunew.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/abfa31f6683337574fbbc515cd7199e6/bujesogodumeput.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/75019695286.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c89ae010b---99574977572.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/52701938896.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a1e30bdf683af3c9ba488cae3769cdf6/mavonerirojob.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ca875d3b---43854240443.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/2823395987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=search+vehicle+by+vin+freePDF 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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 4792 bytes
SHA-256: b08d0dedc431b8174de2df8da083ed132f4c817e8dab67b336da536baf4ed9b0
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 10692 bytes
SHA-256: 1cc3eaf76e0a9bb399b350b5fd63ffe073ea7e24c78befc546ce10f637840bea
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c