Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb3977f6937097e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 03:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9804e2196a1f04c0a531fc0b73993042 SHA-1: 4579c3bd3a942e4560bfe3576a048e54feef3242 SHA-256: 7fb3977f6937097ed30e833967061066b23259ffcfab2dc8ebbc45a513417549
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aordonez.com/images/contenidos/files/gakeguxojamufi.pdf In PDF document text
    • http://industrialsupplies.pk/userfiles/files/89948011644.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/m2cs8hkro04icase2f69u96n5h/nonemofitozexolavixive.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/45393098775.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44aa25a3cd11377484822665c5cee7d6/negamesiwidavek.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613352ce726af---619194814.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a5dd6f51af3ff20d234eb6059d0c6c40/38274507422.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632042400.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144db2078f02---kotumizigilujexurapa.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/41882900117.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/7630585304.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425c8032473---suzul.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/magonalinanuzikuvusul.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/94214131693.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/rufewo.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xividedab.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fmi52aurjonhvi55ikv69nd4kf/godijadufojapoparidilavi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/8000503276.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161408e85bc85b---kiweviwiga.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/bejaredoxige.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xidab.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/takaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=run+3+unblocked+games+6969PDF 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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 11308 bytes
SHA-256: cb8d40e3509180f9addbd0624a67cccb79622d2de23f9ee912c8e2cbc4e8b200
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 17144 bytes
SHA-256: caa8ae125a70505b30811ace9b69edc16dd15bc50be472a42de0e0cdfd47f6f4
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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