Malicious PDF — malware analysis report

Static analysis result for SHA-256 7959c5cfa8522e99…

MALICIOUS

PDF

88.1 KB Created: 2021-08-01 22:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0911ae3278572e56fda8dbecee7d3fcb SHA-1: 05da6caa25aaa857f598565f47396b8e5aa8285f SHA-256: 7959c5cfa8522e99c428408cdff33fea54cd54cc712e695cb976ab83a309bac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM firing further support this attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://alakharia.com/public_html/userfiles/file/41158440775.pdf In PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/43160791221.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/69772385844.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kq7b621b2muh94renk0kqheg9d/zemugefijibukowe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xeviwugazar.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb99aa3da---73399156696.pdfIn PDF document text
    • http://iltorg.ru/upload/file/60736153121.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/gokotuxijidejarawuvagajus.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf08315d4---mejotiximifexigiravi.pdfIn PDF document text
    • http://samtekelektrik.com/files/zorezoj.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/92909432729.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee226e6abe1---kimavasifodudile.pdfIn PDF document text
    • http://alkimosgb.com/userfiles/files/72280384909.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/12456213481.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/kisawesotikefu.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/18796818895.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0a3a7fe4---tuzol.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608999baeeb0e---jelogebekumabe.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/40791158235.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o665eio35442hu484q7v6ccfkr/47330941269.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/81378276161.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/30893967213.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/20560362523.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/divijen.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9a10b4f64---befuxolumaporerafogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+audio+recorder+app+for+pcPDF 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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16868 bytes
SHA-256: 813a5f3cceffea7cee123df796605d92395fe879b25a19133a9705807d17f0d5
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 10616 bytes
SHA-256: 793a0c692dd0c3df35fb8fa57f2fdc2689e403dd520f840c366a08dcdbb8606c

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