Malicious PDF — malware analysis report

Static analysis result for SHA-256 61db381378690b2e…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 23:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a2db3736ec6e7d2647e72ba3a4f4e099 SHA-1: a6f7eb0bb27f7f5679863b20fed7d4ab8416b17a SHA-256: 61db381378690b2e815e837773f916e7d9b20abed445ab7bc95fc8565d5fca9b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of many unknown URLs and the nature of the link farm indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://brianhigbielaw.com/UserFiles/file/61626676219.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bda459cf8f0---nemosizovu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/248ap6i25a2fu5tfgual6bahlo/55204282423.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/xixakigujobipapopupozu.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tusafamofedudepudawozax.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/98188162619.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6937ebbbce869d9be0b69e7e35ac0f12/vilawoxelizax.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607554c387148---nutasanived.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/waxodil.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62a9b7640---19276095549.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7a305c91ac4d4cc96e7214f0c6619271/72785433776.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a242e0b5---kobetojisiberon.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a431acdaa7f---goxabefesesov.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705132e03bf---xapakabuname.pdfIn PDF document text
    • http://accronline.com/userfiles/file/12584802887.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/96788849714.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f14c3d6a---luxuj.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c26eb07848d---suganu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-22/20210522144911327519.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098384ddc001---zalepijanuvasobo.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jupadubujod.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/naxakovisiwebila.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f38788ed---99837367604.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/43526609669.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8792f4985831325b5d595b6d7ca760b6/fipudasenegaguvolunejija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chicano+font+onlinePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 10196 bytes
SHA-256: 03012207bd4fa09381e28446b1ea424c299705d4bcbedc1cea081ec4328bfb45
font_01_sfnt_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 18080 bytes
SHA-256: 240796b2a2134cb09d378d6b6a6f1b583519b68bc6b66e1125f0920c9eabd586
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 16084 bytes
SHA-256: c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb
font_03_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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