Malicious PDF — malware analysis report

Static analysis result for SHA-256 632a4910c5b2abb9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 10:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fb192acec42b07d23809cadefcebb15 SHA-1: a102fd4ba8463eb1278fa7c11d7127470a8df86d SHA-256: 632a4910c5b2abb9c77b91af4a0e33eeeee9724b19d36b9a189d66340d7aa00a
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. It contains numerous embedded URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO abuse. The presence of external URIs and a link farm structure indicates a likely phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://flomogroup.com/upload/files/xovejokubatibimo.pdf In PDF document text
    • http://31kouqiang.com/userfiles/file/1624576002.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/50664697501.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca54e8587---21079418231.pdfIn PDF document text
    • http://polipack.ru/content/file/sunureberapuwapa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7lpomcsjsh76fmjr2cfb400e66/zagaramipivazifasire.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/walinetoke.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/lelin.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/56006926217.pdfIn PDF document text
    • http://abwessex.com/uploads/files/kosiworuparojiset.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5a796e327---gemir.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/pitagalaxikorewajeketubeb.pdfPDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6399dfa7c578303dbc35c292a465a39c/88029282496.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/tebivelav.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80400022696.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160868d6589e00---kugopujudafixobitezime.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/42f4eb9bc458fc7a8bd74d8cfda9047f/madepigasuzusediwasuzesuw.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da543acf39---sotepakodoweluz.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/fikomulebek.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0409577e11---45160302466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solid+figures+worksheets+grade+6PDF 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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16160 bytes
SHA-256: a7156edcc607d2a9020409f531e6c872cdbdb106636e46d11f6784e1e99c6e82
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 11048 bytes
SHA-256: 1a7fd4116284a0df08bfe38ac4522c69d4a1fbca49ccbcc428710c22d76e3a8e

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