Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ff1ecc2463d562…

MALICIOUS

PDF

113.6 KB Created: 2021-07-31 09:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32911683937ba75d53c611aab5c2323d SHA-1: 9dc8df0875ecd9e5e342ee0f7748877cd219580a SHA-256: 45ff1ecc2463d562401c876a819e0b25c153ab4245dd41920cbea2c681f34ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://oniceh.ru/uplcv?utm_term=libros+tanatologia+pdf+gratis PDF link annotation
    • https://maribon.net/app/webroot/files/userfiles/files/27876625675.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/usce0gmt0bo6v6qdrhn8dr4a9a/fivekadifimadigim.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/zotulejenafigupisoxo.pdfIn PDF document text
    • http://rts-3.ru/upload/files/xewafulexaza.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/81962277419.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cec029ab5fe015e7e62c228f5fa2ef93/mimuzebi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe4bd7cad3---166770252.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/setanenive.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/56489607278.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qdigqjje5kbdj0vucm1r04vg26/tepageviluj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8fb2cf37f27cadc93b384c466ce6df19/raxalilekiwuxixenafuved.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/332ffd76bb3ae6203251a464bc1aeb80/wixowisakitesufunevukax.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608840758dfa0---nonemekozezemotaborolulis.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719fc181d1e---danas.pdfIn PDF document text
    • https://shibbirs.com/media/files/44959485845.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/jomazarubugenamuriwar.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607188f416c6c---92218165486.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607524ef24626---mirenopifo.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wodagusikanarixul.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/7853883315.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c251b6d0f3---kasigigubekejef.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/36905774950.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/59749438915.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_off0001547b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547B 20140 bytes
SHA-256: 7f276279412ef20019ed55d3a6529fdb3801ae5ea89af14858b155dce7ed4358
font_01_sfnt_off00018777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18777 10640 bytes
SHA-256: dc1712b459b0ec74f1a1b4a6bffd7824bff50d82f37069dd7599a71b2290393c
font_02_sfnt_off00019f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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