Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c76f7501e3cfa2…

MALICIOUS

PDF

84.1 KB Created: 2021-10-11 18:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0317606d83dbf19edbe009c36342d50 SHA-1: c35ba2ed61d62694cc8ca00e0b9a8b96cb25ecf4 SHA-256: b4c76f7501e3cfa2aee800490b6360b17b9602b3a897b133b6cb829bd43742b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://naplesredeals.com/userfiles/files/59874175017.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4fb36e088bc072097ccab0ebc449b7c1/67665978865.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8fcfc8a0ea71fbb8f88387df4f3feb61/71024287061.pdf
    • https://isigakizima.net/img/tmp/file/78467448086.pdf
    • https://liguecasa.mmsfoot.com/stock/file/40751174131.pdf
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/64352434471.pdf
    • http://casier-a-bouteilles.fr/file/32896583346.pdf
    • http://sapientgenerator.ru/files/userfiles/files/ruraveteduxibudodif.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/munibuwolurezonadaki.pdf
    • https://gulf-rope.com/images/bulk_images/files/6717181809.pdf
    • http://www.travelwithtaangoo.com/img/file/runevup.pdf
    • http://miyozenemeryville.com/uploads/files/jefadudejufopuxer.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/zufolebegifuveb.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4577b3624---rejizutep.pdf
    • http://lokalizacja-gps.pl/userfiles/file/85438637969.pdf
    • https://seeandhearbetter.ie/img/shop/contents/91514680472.pdf
    • http://flightshop.jp/images/blog/file/rurox.pdf
    • http://ancheng-medical.com/uploadfile/files/sozexakaj.pdf
    • http://goldendazzle.com/upload/quangtri/files/67939122565.pdf
    • https://rewaqousha.net/userfiles/files/sanobawatisozemotolebevi.pdf
    • https://jackyrouxmethode.com/userfiles/file/nebakusaromakirimulanuvuw.pdf
    • http://calisnt.com/uploads/files/fubep.pdf
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=new+studies+in+the+history+of+american+slavery
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 16792 bytes
font_01_sfnt_off0000fada.bin
47af3771c4eb1309ead30de27727e1a5e330070337473cec4665b3e4506cbc06
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 11084 bytes
font_02_sfnt_off00011499.bin
f0e004e587655fcc4258609a6ff9ea77021e3ae67e1f3b19ad33ee9f4d7ef40f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 18004 bytes