Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b51dd3667157462…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 17:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80243dcc641d7b29850a0b9289a3c0bc SHA-1: 3cc253830736504373d191c4274673cf48fe8af4 SHA-256: 6b51dd366715746299899791ccaef9d6b7a587b2a5e2265e906c0d445d7da1df
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns suggest it functions as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tanthueviet.vn/img_data/files/398090405.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848bfe04eab---75294766999.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/26279025056.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f79471b4715---23812223517.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74cedc89c1ec674e652398448661e698/33431967216.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/ponubef.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t84tu3epf7rte1pfv9toj5elo2/xoregivorisokewufem.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dc4133b4e93a26fadba51fcaacead63d/282152407.pdfIn PDF document text
    • https://umartravel.com/files/kofugik.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/37940382856.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/sibetowulojomuwesunew.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/da6fd732fc5e0f82a9926a511048a439/91488994375.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0994c4f931ccd4966c0239711b64bbfb/58826817040.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/dunejisizenudubudajukij.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/361795eed06b1773048ab243e28b339e/ditovexopilen.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b0cb2c820---kapusixituwoxazofivolof.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/65691849883.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/mivesim.pdfIn PDF document text
    • https://nexusmediation.nl/files/vojigufomudaxaf.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/2774737793.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/niwejibi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7f1e7a03f1f70576a621921c7c6055da/derakeb.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/01bc4fa5ae3c84e59f22b2d20ccdcb53/8778854415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=noire+the+nail+bar+pricesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 10588 bytes
SHA-256: 525698045912b72ec572ad9590e1880b4de773bfa376a9bda77b43f6bfb2560e
font_01_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 18520 bytes
SHA-256: 175e5c2d4370d0f067a960dd47994c3f71aeaa2b20b5927d734d936e89bc1b57

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