Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f2b9eba96f490d…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 02:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6662369635c4d46281bd9e9a94b49f49 SHA-1: fda6d4f6725b272759272e10717507f1c193cebe SHA-256: b6f2b9eba96f490d24ede6d2444763e8320cb821dfbf6f3f6a54ead7fa3328a9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the document as a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=i+would+like+to+be+there PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160713e63acd8e---14621944182.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p5h7duvqq8sujdfi8siu7su2n5/34428482440.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nozawadeb.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/41661ca83912ed571d5e53734cb5cb0c/pezaturaduserabodumetuzaw.pdfIn PDF document text
    • http://newo.ru/files/files/xoxeditaxabowuni.pdfIn PDF document text
    • http://cloverdiamond.com/file/ruretesuvafon.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddef7bab91---wugotapepowexexefojuza.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/33506307624.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4homlq6209egpisaq5tkbcl1c2/36758248215.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/rinasonobowedadusak.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/90462781323.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/10679221882.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e2cjq1arl2tv2eehm68oto92i3/zudijafogudejip.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/95516301958.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/6804743374.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a106d7312---fenetawizagul.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a67ad516---texomi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q4k0l97rc02c2vahg1g50tma81/7857289283.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a473d51956c---69412860476.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607711f34104d---85540200723.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/00d117c84c89f23e0a11a4c72a7dff36/46537095781.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/54217791851.pdfIn PDF document text
    • http://eviinstall.com/userfiles/files/88578291945.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/62437681485.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_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 10280 bytes
SHA-256: f6e5838be129a1a3f15709a00996daf0f9aabcdf02e7f1cb47062312430cc470
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 17892 bytes
SHA-256: 34884216445fc00b411cdbab49297b1d1c51f61bc6175fb46a6e2712596165fa

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