Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c4fc2140c31f97…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 09:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34da32a2879c060c2b7c43ea9beb11a5 SHA-1: b864a6ffced79e3474ca71c023496c64b912e134 SHA-256: e1c4fc2140c31f97663bf272f06f5c41e003975357683e5c37b383a0b57dff40
156 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, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple disposable domains and a compromised WordPress upload. The primary purpose appears to be phishing or redirecting users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=engineering+mechanics+by+hibbeler+solution+manual PDF link annotation
    • http://perseverance.cyou/updatefiles/file/45429171475.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/27489208418.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/4057776440.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/41257300835.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/fodisubaribofamutufi.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911105412.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/gafote.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/35228424975.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/wumodunawafatanu.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/nitowozeliganimorozuvugiw.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/34497166408.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/73764121227.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/2235806464.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sidurivakisomaxurewujepu.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/55942911472.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/fuxamojosagaragudanuwedu.pdfIn PDF document text
    • https://thehouseproduction.net/file/sawaxufor.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/67944358984.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/97652867885.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vatito.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e006ae52e8a59ae49b99cb0f2f3d981f/kexewiwemajubu.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/vulabukej.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84c4858d9---40854607707.pdfIn PDF document text
    • http://innotack.com/userfiles/files/25521622368.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2083d18cd---fewaf.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/felawenejaludej.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_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 11012 bytes
SHA-256: f678df06873098db710d7ff2b2e7dbd9a2db658bf161d0fbc652318b31997909
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 17540 bytes
SHA-256: fbc652d1abf9474a45232c51428a6e8314ed303ad9c18caa34928fabaf4e9451

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