Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae22413d81189015…

MALICIOUS

PDF

145.2 KB Created: 2021-09-17 20:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 906eceb959745aa095d2f64a70dbdd08 SHA-1: 63d7d393350455f2048960d42d18b4ef8f6cd666 SHA-256: ae22413d81189015586e4f4413db462d00ec48d99ce5845cc54463c60cd84bcc
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a link farm on disposable hosting and a lure for an advance-fee scam. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the specific heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggest a phishing or scam attempt. The URLs extracted point to various domains, some of which appear to be compromised or used for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://huntic.ru/uplcv?utm_term=busybox+free+download PDF link annotation
    • https://contabil-fiscal.ro/mm/file/26527779063.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/vijexobonopidowemo.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/disafopisofubekigikaduwa.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/39478628481.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mokipejufaris.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/95922322937.pdfIn PDF document text
    • http://semanbio.com/upload/files/99200284327.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210901183341.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf8e9c7ee9---13795135450.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b2ac2e97---46719130991.pdfIn PDF document text
    • http://domainecomps.com/documents/files/rosar.pdfIn PDF document text
    • https://amgaa.org/temp/files/10591874680.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/21683380699.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/27080294290.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/zikunup.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/39514674305.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161362405dce14---risuseminotabunoki.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/majebojanudokixopegumesag.pdfIn PDF document text
    • https://preciseenergygroup.com/media/fomikev.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/tatajazatesome.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/92f187c2feb46bd9b94f0596b2c77251/85939299791.pdfIn PDF document text
    • http://eventechsite.com/files/files/guwigijadodomipozobusudud.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/mawatusujure.pdfIn PDF document text
    • 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_off0001cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD7C 21364 bytes
SHA-256: 31f0c149163ffca1e3c5cbbbc149ef8c0bc72806a4e949f4aa7d21425dc0259c
font_01_sfnt_off0002061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2061B 10752 bytes
SHA-256: 8cda34a49716c63bcf3a010278f26dc1cf0757621a51cfdfcb3a5e81037670c4
font_02_sfnt_off00021f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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