Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e4ff09502d176e…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 01:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: abc3752d0de638cc71b200a7ecf8344b SHA-1: 2a0a838fec108beeaf5808f8ccba06d6702369a0 SHA-256: 76e4ff09502d176e977adaa8f870985549ed12fb3ef3b3fc08e93ab97815eb12
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a malicious intent to lure users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f25bf3e4---44839930103.pdf In PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/lopizegugoxuxot.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/80b0c8f06887234de6100a068d061a71/raxufizivobatamuvazep.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8a54c24e---gulorabosare.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/95047135869.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p6nuf0toieqirdi7btg0fh7qp4/gutasif.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/lupofelukomatuk.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ee8c2b86---24427880178.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/munuxexuwefavewiw.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mdq1ocbven8hcnt4jqvq56ougg/82212287228.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/r8jriseo4iedg9sc92tmob9d4t/gegokivinovunig.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e9684886d---14925023672.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e46ddba1---jixivobiv.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d2afb641a---34114763841.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lexizegilumoxige.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160805c2b9be29---lelagawofil.pdfIn PDF document text
    • https://avela.md/userfiles/file/waboposibumured.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa37868d04---42137529670.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasebutemosuzukusog.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf4af8a9b5---nimabononexux.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/53506465542.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/baselegabinojupokake.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/di1cc5rbpeg6pg8sr66vbcomu6/93008174292.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/76486079607.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607768b06fe0c---bawofa.pdfIn PDF document text
    • http://polletnv.be/uploads/files/dovajejozikexobakexeji.pdfIn PDF document text
    • https://avela.md/userfiles/file/wubosapovolotowejil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+editor+online+add+pagesPDF 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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10676 bytes
SHA-256: 163e5a3af60ac01a77e1a38c0ac7f1e64f627763de3bf496f89d4a128afbe5e1
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 17372 bytes
SHA-256: 9e7931ef1941577422b5637c1a8da5f2e7ce03e22f7eb0e32031cbd2b125ead6
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1