Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a48489f33159ab…

MALICIOUS

PDF

78.5 KB Created: 2021-07-19 01:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da4168afc3e603028f62947c506ab2f6 SHA-1: 330416eb1d61e75cd4585cdbffbb0f7012177f39 SHA-256: c1a48489f33159aba694629e609d61b7d4b2a4d778430aaa8ca790e91284dc3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bbgpiti.com/userfiles/files/wiwazamogowenol.pdf In PDF document text
    • http://bartuceviri.com/userfiles/file/sotatovedowaxilabiveg.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/43464455741.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217152053581325.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/37221517937.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tmppv1b61jj1npskjhd1p4g21h/gedolabukitezuxevumimesov.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/59fhnj8cubg14sd9m9a22vhg86/nonekute.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/37001803440.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/01e8f4e65fff4e25e7571dfa6b7d27ee/pasubuzesuzitekora.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b1acbb5ee---39167912727.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a03e48fde489d1747507a6f229d0f8c/mamidagepunuma.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/9353065754.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/sudeva.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/87041410561.pdfIn PDF document text
    • https://cooperspick.com/files/jozubiniladisit.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/13764866207.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bddd9528d6cefd1d1eb43c64ddf8a51c/5668477949.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/83178339793.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/74e14e4b44704cc77f93c58d7ade486a/35016104069.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/muvidegos.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b44d7e821---23657470040.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/690799390.pdfIn PDF document text
    • https://airshow-bg.com/file/86255442898.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/121a277f487b93b284bfe49e146dfb3f/semijevavokoreguv.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/44863565880.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfe1bc08b0---rudorenudupevupegav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=printable+master+grocery+list+excelPDF 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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 10932 bytes
SHA-256: 00cc9a17aa7223f464d960db81a92e15d8c31bf2d234a43383421acc8a872a14
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 16772 bytes
SHA-256: 6ba42457f33d861e83b6366c56d3497531ac9f21a5130daa3ba07a11ee41490a
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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