Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb41fbef128596f…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 02:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82fb4da0db7f14066a46a0d679a51676 SHA-1: 5a1a31d8564ec1d6901444ef3c1b3ccc6e352fc3 SHA-256: bbb41fbef128596f84a0f6e0a750106ec43bf1d09da88b46ddb9896234089d5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains a malicious payload. Several heuristics point to the document being a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1nkd5l7c46qcdklpk0ac3e8dii/18560950909.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dde80558a---xerup.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/88963344334.pdfIn PDF document text
    • http://northcity.rs/slike/files/waporanutevex.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jisd0vam5vlejihb4oki4c5r8l/14163246674.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf880d207---88028559788.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivuriluj.pdfIn PDF document text
    • https://andhimazhai.com/images/files/badinomo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e92c145ab8---89358696053.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdf76b5d5d---xelutowokewew.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bc3b2f22ad43925aa5283ef87a251e52/ledisafotowisigagog.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c516260d7---52258845914.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/fedug.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b2c9208e8814081225acb2a42a12d263/126680609.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/36448945388.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6b63a0dfa606470242b28f33c02e374c/45701579073.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/25j2h5pnm6em9bj1g704is2th5/dikerexowosoj.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/fawebuvugotonase.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4688a4c9f87381ea13e3e0554c578345/11993450445.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/5552497822.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/45263980264.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a796b2a9795---xitezejadovivudisujaf.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/manadixafix.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161299a869c1bb---keteretul.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a3575b1e67b9abc6d61b89334fb43b1/64973507819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=simple+modern+answersPDF 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_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 10616 bytes
SHA-256: 81e4db3745722958126fb5bdbb1eefbf4f47d37972bdeead3cd9c5df4861f6f9
font_01_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 17996 bytes
SHA-256: 86caf72ac192d18edd68cf6e8849b895f4bb80e6a03a298d0ebaa55b8e31eae2
font_02_sfnt_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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