Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe428dacc9173888…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 21:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7386463dbf802c9bc80bc2727834f16 SHA-1: 5d6c209e216be2ee205f55973d86d3a582a539a6 SHA-256: fe428dacc9173888276e13eb785fc4ac3f81af9f900c499c4359946e5fec73e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a link farm designed to evade detection and maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6a88871c5d0779775863ea5a6dc60b04/rogukebuzewip.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/laropobisawajug.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a3869387f---60163842171.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f1492f8---zibixamadibo.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce872c544fedc6bb615ddfc984636368/lasujadawif.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc0f7d5a02---10134829350.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/02cc6e148a26804e649cfa02cb7f9a46/tasexuf.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9d0e9d978---molazugizigewumukuzixet.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/3599781567.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4d9eac3fa87bb1f0e24a53e71c2ff8e0/81310014138.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/riwatunaviterubosab.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872d9ac461e---dorusuduzuk.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7b636228b80d51e961199c6b094e109d/pezorixujeleteze.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3426c2a3---74785864937.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072159739fc7---nuker.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160becc7575bfb---rereb.pdf
    • http://hornets88.com/clients/56662/File/85876868819.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f476cb5947---31752978851.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/75049636881.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d8621e8---tunovukuxesotuvol.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47e91edfc---tagabigodezaxono.pdf
    • http://schokozentrale.de/idata/pitib.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da0a20d54---22697805867.pdf
    • http://businessvaluationapp.com//fck_files/file/pajeko.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1b77f525---23623733931.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=70+out+of+80+as+a+percentage
    • 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_off0000fd2e.bin
714b4a03f4cc1dd9a581cddeb24e6edcd2ab2851a1796032c2c93a175d002b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 17580 bytes
font_01_sfnt_off00012b2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 16792 bytes
font_02_sfnt_off00014344.bin
6b4ad7ba5a4f6bc3c571024725d4cfd67cf5c48dde534f4e982963c7b8054bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14344 10900 bytes

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