Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca4e2ec8c510963…

MALICIOUS

PDF

80.2 KB Created: 2021-07-07 01:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6852bda2e45677507f51575b3615cf19 SHA-1: d4cbd50817629a392c7f63962317d87ff2dea2e0 SHA-256: 8ca4e2ec8c5109637f7380a047558886451da3fb906d6f53665f9bdfe8eb7cfb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://akcjonariusz.com/UserFiles/file/gorezinudupapugeburamub.pdf In PDF document text
    • http://europavloeren.nl/siteimages/file/69004984344.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/83249948072.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c6622e0a4---momedomagotipumekibu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7lcdlbukdatigbr2pjgre4uac1/buxalojelereripowagi.pdfIn PDF document text
    • https://123natura.com/stockages/files/xurilisujowisimilunekom.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/21f13f6530b4829140c1ba454fc89c7b/76305284096.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2706e5d79---berunuxeniliweve.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/6654446685.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/71106690918.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/8908423963.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/56060430940.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/71156691736.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/movep.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cd50c57a1---ragogeragov.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1fd945fe009e1326278d129ab48c2420/pefadafu.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/wajodez.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a151a1822af---79858356551.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98c30e81f8b32dabc9d379e05f2c571c/budidifazekesilatu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967ec618944---fanatiguzufukujerigemokab.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/musufo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855de1ac6fa---bidanikotuwojogo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6930594a9---zulebagegu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080285fb172c---rewokokixazireva.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/sinoomlvhf4g62j5kss8o48un5/gasupavatid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=words+that+start+with+lambPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A6 15556 bytes
SHA-256: 5ccd04a02ff2d80589324c643a0cb912fe5cf15b9f5e7d660b7885dc92169d91
font_01_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 16824 bytes
SHA-256: 3c3341aca459b6e03d7d0855b26da34ab8b9c07a3312ea837eb77fe372fbb282
font_02_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 10496 bytes
SHA-256: 7586aa0af4a9502945264e06172b2d7507b28f2f843e94d6eb619ce31fc386fa

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