Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8e623db4091d04…

MALICIOUS

PDF

82.2 KB Created: 2021-06-25 19:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5249f0920d71096acb8f49193ae92332 SHA-1: 50a187adeb9d03e86bdea626fdc4131db587529f SHA-256: 8f8e623db4091d049df29895b53e4b67b02169418e010c47d997514fe71b43a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=cool+wave+raspberry+pansy
    • https://luminex.pl/upload/file/deropufagipudibidebovux.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/456b0527a0a0b198e2192f9fa3f0ef80/luropabajidajozu.pdf
    • http://mnwebdesign.dk/userfiles/file/nureri.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eecc09f18f---79763721232.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/67638d6d784b50f5ea77b0650ba83cef/72926126205.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa1ba843d---77008041016.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5gkkktmpk25v5941dhkmksv2r8/76107631954.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc50abd519---55216129723.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/01f06d625cd233a19d2718647d6cb105/58726607074.pdf
    • https://moto-trend.cz/public/files/fck/file/84812192567.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c5222a2bdd31b38b787559c8eb779987/32209288597.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d080529132---41825911275.pdf
    • https://responsible-tourism-alliance.com/content_file/files/fatumugelerelova.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/t0vidadfqc48e7lru2h3ia6vu2/33115979071.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c201a59a---95393456937.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/c523b9c4c9a5f60c5a5885def9c7a38f/61004236648.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b381a8c78eb2d16578573485206a49d0/bekakoxikibunodi.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4a7329a1---20151255033.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2pfmjf9u55lbnvi4jl2bl7h9n5/32515034531.pdf
    • http://volamtuyetthe.com/userfiles/file/seforowatimatodowisadage.pdf
    • http://www.ecvbrass.ch/user/web/file/sikepisikajamo.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/smojppcl67i4vjo0662l10mrsr/zorekobamojidigika.pdf
    • http://ankaser.com/userfiles/file/58763972936.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d2430727196---lidizagabosalawitaladaxo.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8fec34b89---7771550312.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa134cc3cad---netitezife.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/20283756823.pdf
    • http://jnnycc.org/userfiles/file/niromuxaxugijigobegu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4c.bin
d2d61b105f860bcd5036e8a647091787fc27818e21765554629a7bd6c7859d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 17164 bytes
font_01_sfnt_off000109f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 16792 bytes
font_02_sfnt_off0001220c.bin
27f0cc2105b59e4f599a2072fcb0e865ecca8c0403c5fec6ff8b896748ee4169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 10492 bytes

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