Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff4ffbe1d7e34f7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 23:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81c9ff7b3702534386a60fc579d928a6 SHA-1: bbb64fe1f46c0f76deea8b58b204480e05721d83 SHA-256: cff4ffbe1d7e34f77c24def73002ceed721cc25f43a70f71ac934ec7d4663c98
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute phishing or malware. No scripts were extracted, but the presence of multiple suspicious URLs points towards a content-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=audio-technica+at-lp60xbt+manual PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7271b892f1---42981726097.pdfIn PDF document text
    • https://superpart.com/files/manalijafunawukawojagegul.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/11033284816.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/88769848563.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/51250240297.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c675ab9758b---nopogajodorijo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf8d2588---puvepoz.pdfIn PDF document text
    • https://ikima.fr/uploads/file/32544592634.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ff6b42f0b049ec0b2127e995b14ed6b/segiliginosemag.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9035ef34b---13078099718.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/wovileminawutepuzagabipuw.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/95eb2fb15b229dc2a5526a045fbdad71/rozuranigifot.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/xalewoxovusiwo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805fb677bdb---32596647796.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d79d0f0ee---43501937457.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77609987---47654713195.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/44251ddd292024ff6d3b089937421781/35001971163.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/xoratewugagit.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9cdac821---19461490467.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/topimawaxuwovipeto.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/maxaro.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4e73d589---jexuwax.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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 18604 bytes
SHA-256: 9dc85d603059c4fa946813c2a823d0a823a2b16164ceccf753d1d7cee251f447
font_01_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 11156 bytes
SHA-256: 1a7c188b40d71a94fa6a4d749c118a9410067357e2dd90c29e32cd70c0b189df

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