Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafd3eed06dacf1f…

MALICIOUS

PDF

92.3 KB Created: 2021-08-08 21:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b79cc8779a3bf351004278be028e79f0 SHA-1: 37f1c308ca0769b709f959b48e69c50d0118b40d SHA-256: fafd3eed06dacf1fc62c598a5515b94de63c19c2933c7f54e0bbc1a916dd32ec
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure as a link farm, coupled with the use of UTM parameters, points towards an effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=how+to+clear+descale+message+on+keurig+supreme+plus PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be97c8f072---49888476267.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/47027483460.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/dogosipevipilutonufu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1f594958---20854649169.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2fc62dd34---jewapiwor.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/lotesonidivadudapaz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3198c8302---73746400010.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/26730326830.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608849ecdddb6---woxikugo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/7907603041.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/turuximemelevo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p65fb4lbo4ufrnq4umfjogat0u/kebimerawamo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34198462369.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/54699298408.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/50276286bfcdf44728dd7d83d051e528/pixowetegivetupasisosuze.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/xazelirewoborit.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/45116104952.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xuzari.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/mavakukejetowaxekuposij.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6ba390d6814308ea560e7a1776821319/70198298722.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/mopivufuvir.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077df45ad1c8---43423913864.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107151638269009.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/68e0e6ddf220ede71d2ca6744407fd21/misaxeki.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vufalevolevugusimajodo.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_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 11128 bytes
SHA-256: 99d273eaf2f95485db12e0db818a495b041b84f1c1074bfb1d0fe3e2fb882bef
font_01_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 17456 bytes
SHA-256: 94ad2a192aca8d08a949bf95266da53c7cf8c85526f63f19052b7d032223de16

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