Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eb9caf4cb8e61a…

MALICIOUS

PDF

76.7 KB Created: 2021-08-29 15:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f78aa1099806ae6491a7c650f8111e6 SHA-1: 32ad4232793ba38a7ab737d47752a008e1927f73 SHA-256: 91eb9caf4cb8e61a82ca7fa31ddb2d3047eeab97eb3d55dfc48ef8801301cc6c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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=convert+text+table+to+excel PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b2deed6c0b8ee839870538924aa93442/jokorugexaxidufanur.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/69fd01784bbacae468c5764d91179465/gumidetabil.pdfIn PDF document text
    • http://megalaserasia.com/upload///zirixulutadimujet.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49a228b5b---niluwibikixidegiv.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf54umi1jk6srherutiq0b7qnj/tinurukiwiluvofe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161027bd5b1ee3---tutusivutilikanawowufaxa.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/78357770498.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/45310427377.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4dca5c121a8d0060bca8f20a90b62454/89172065632.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/dogifigawuluwemavano.pdfIn PDF document text
    • https://area5srl.it/file/27155465657.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/feminamagakedotalijadef.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083a61ee2dec---12665192999.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/fafeti.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/c90d714a1779ac6070efcd595c655452/59311108206.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/76442757101.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/kinaxiwukoza.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/samolezimevazapa.pdfIn PDF document text
    • http://ombs.ru/uploads/files/duwibijeluxubokoga.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4877f8b170390cf068b7c8497d80729d/gilasadorijav.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vlimbkaina807at1uiijvlu5ac/medavubiketugixi.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vonud.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/zalamajawanokulome.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wetizif.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/dakusigezidesufovo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6e8eda38ce42160992e79c2e2994ae6a/50536520254.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b50e3146---31651800203.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_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 17404 bytes
SHA-256: 7a909e8ff48481dd123638827feae720c31ed029e884e84d2559d919b0b3c2fa
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 10304 bytes
SHA-256: bbd6f4df472aed596789a7cea57427a25800246d343b9ea459e56850141e9e7a