Malicious PDF — malware analysis report

Static analysis result for SHA-256 b539b826cc04393c…

MALICIOUS

PDF

81.2 KB Created: 2021-08-25 01:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26ebc57c9eb03975159bcd1b0d2a5314 SHA-1: 9a0686c0660b8c76ffc0d648273895dca2526e49 SHA-256: b539b826cc04393c788e5ee1c66e81287b927fee59219b31046958ed52b3db3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure for a phishing attack. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to lead users to malicious payloads.

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2fd43afff---vumazetetob.pdf In PDF document text
    • https://khanikango.in/file/61776102962.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c1e33944154fcdf1776e65503d708f53/razajizavaneveviwusoni.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/14798502332.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/boguzoxupifir.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/volivajakobogenuwibafofol.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dffa40dd8df---89451942258.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/42062666175.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/76777661452.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/93050316252.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nenigumiben.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/pugeva.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/17252435163.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/76027947196.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0739d24c52---36588426172.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/23fccafe6a1cc8a04cad60e20570e2bc/bikonin.pdfIn PDF document text
    • http://siroyensao.com/upload/files/20183977568.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/6701364179.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wesenozexuvosewademunis.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1f15ptis6eui2lkih7q15elilr/86291685696.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88667047158.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4084b1c752---19390879422.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ge3adld52m8ese1ne3cvmgmot6/wetatamofivasos.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/kovas.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a28a2d42a---zopil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+lido+book+club+questionsPDF 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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 10644 bytes
SHA-256: 2252ed77a47810e604cca038ae565ca03e7c69d71c6397b92fe2192664e83708
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16728 bytes
SHA-256: 0f13e91e8514946a180ab8d366a683a5b8183479799957f5f56f731171877859
font_02_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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