Malicious PDF — malware analysis report

Static analysis result for SHA-256 99120d666d5822ee…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 03:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b267512245ac76e544ab23c44d789d19 SHA-1: 6bc6c1c4ecbc082f4d86479fd3ed2a24d3076e9f SHA-256: 99120d666d5822eee607514f643405c2b0a30492e9bc4032ad1399914337fbe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The structure suggests a link farm designed to redirect users to further malicious content, likely other PDFs or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://wang023spa.com/userfiles/202106file/2021062416512770554.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be817f83752---totabivevar.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b1d453ee0d4dd8896e6b787948c3fe88/vopilinomusadokemu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/reretefezubebixijimomiwez.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/bigigogejivu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d799db7ed8e---10997723720.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6d3821e336d1aafa9b64393ad1aca9d3/goniwukuvozuxugul.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5ab77b0440e578bf5ba24e53f9aea5c1/busakenipaxolasixefun.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3e6846f8d2b67e80e0fe8e08c49067d7/37037266383.pdfIn PDF document text
    • https://airshow-bg.com/file/boleti.pdfIn PDF document text
    • https://netpage.info/userfiles/file/28412716190.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc991c21d1---ledaxiwagizirutilebamon.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7350517e62---47402624114.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/6224562824.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d44cdb001---javopugugilivubofuxafow.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/27909678141.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b94bc7c43---26916911996.pdfIn PDF document text
    • https://medtek.vn/storage/file/91523947477.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/49395546435.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5d04536aeb340d139eafd14d16f6e4a7/99563432837.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7fe17ad9e2f45f407a54db1c8dc174ae/woxiliwubu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e914bc5be---33552966317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=automatically+transcribe+video+to+text+free+onlinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16516 bytes
SHA-256: 01c16b17f99d5b010eaa910b255a247d6840c8600f45618c50cbdea55052da8d
font_02_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 11140 bytes
SHA-256: 6ed817c3f66a3c476daa97abf740b63e898df3bd123919eb9e68aa53a851d003

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