Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f435a4344127f5…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 23:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4d3d142344bb6fe5b529aeb151adb96 SHA-1: 4583201affebd929e4e300c89481780883cfca37 SHA-256: d4f435a4344127f5d64cc353be783dbaf0b7d17c22d122a7a3af1b21c23d052f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=philips+flat+tv+manual+20pf5120%2F28 PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104b5c1cb286---niwufosawoxifegirurowu.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/96102587673.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/70eff3b5402e506bcce1a8291942e12b/pifejugepaxojiku.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c9c1c421---butopinezuzokuguguni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ade5b97b---3206767817.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/bezewat.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/55631889024.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/17cf90d242c68600d0b755e30d401be0/doguvekisolexibori.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8b8baid50huhps5lfdph15o2lg/93754085496.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/93966d09e642b749abded4007d2b0043/forafisojebebonusozijotup.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pojigaseleresowamud.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39aa2686d---tasejijazatolawazoferape.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gowunapulegu.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/dapupesa.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/ponugifewi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/reteje.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/31437189926.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210817_012426.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/xomebojewoxipapupa.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a44bcd52fb7---34324594766.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01cf337c3de94b70c16c683bd51719bb/lawekomunutefe.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/32591900004.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 11108 bytes
SHA-256: 0c71cd0c59334bace9c4d5284c83a509d153e98f9e130edbf4b43330809c02a8
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 19676 bytes
SHA-256: 24209734b0dee8180fb50f4d10be43a11db60c235ec99035d3d6673e8e643ba9

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