Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd0fd129827cc6c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 02:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a3f05ad673a0d29a219ee7094871a075 SHA-1: 0c62628e17a7b3e38b80e32a60b16ff7586ed1b4 SHA-256: ecd0fd129827cc6ccca88424f001ddb18ea8f322e525a32b2f60aaae04585e60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50bfcb3c8a3a3450e7750cdc8a5b2f08/xebibigosuxexezafunu.pdf In PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/wizul.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/7440248549.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/27283700751.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/rileketewozepiluwol.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/52265715081.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/69395563161.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/liwelumafitigemigob.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109060804498654.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/xumonuresinij.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/lozesigapirojo.pdfIn PDF document text
    • https://promise-land.com/upload/file/18150470579.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/vodivugukobowan.pdfIn PDF document text
    • http://standardamulet.com/files/files/625592569.pdfIn PDF document text
    • http://entrackintl.com/uploads/33543487778.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/99183116334.pdfIn PDF document text
    • https://laps.pl/userfiles/file/bonurigadejogimelenaferul.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zexaxizipogijaxoweni.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090109581614802.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lb0fmpe8gnrgf6rd5kl7vdnhu4/89043522810.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2b46f44f---tizunuvoxarus.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/99627004864.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210911050651759.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5edc0851f4775a18e9ec2aafefea8676/jowaseranevofok.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/24329242114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=top+5+best+emulator+for+free+firePDF 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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 17076 bytes
SHA-256: 73065a42c0656c7b0e83474a45a43e9b8ee432d2ee0da5f34f6795c412d7a78a
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 10752 bytes
SHA-256: 63d7f4cf91a08414fc776031ee52257021cbfcd8dbca965877b3ae330cd44a0b
font_02_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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