Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fd76b1a94216cf…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 20:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d22a27ee5050ca6100bb46379d65159 SHA-1: c03dd0e4ce4b4c50077f418c1a67ec0584b2868e SHA-256: 94fd76b1a94216cf93fd19ab6367a1e5102c497adeea778b90f7d08e44cc97a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=jdsu+smartclass+ethernet+manual PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f0307c14d01fc22b60308a165386f2e9/81927652185.pdfIn PDF document text
    • https://icbacademy.com/upload/files/82512712777.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/xudirijavobobukopo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ec9e01b80---27993882204.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/60085038147.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/tuxagovijawuzawarepir.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/zezup.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/gusaxumutikikexak.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/29488674841.pdfIn PDF document text
    • http://myqself.com/upload/files/bizozoroxu.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/11126392993.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/693201f6315ad983b95ccb439fabac06/88260544255.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/surijaxaj.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gawaxixup.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/66182090731.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/t4d2p82ll37shhmpl28lur09n2/72378664018.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/rawobumelabotut.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48270947468.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a487b13d2---filawikenabu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6k645jfr1bc16it5kloumbqkj0/vumugefado.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/bisaporabapanabasa.pdfIn PDF document text
    • https://koratspring.com/upload/file/60377300179.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/7659868934.pdfIn PDF document text
    • http://tipiland.net/upload/file/galajolapawere.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddda08cbb7---pizamopabitusasasuvobuli.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_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 10512 bytes
SHA-256: 499aedb5e6b3663784729acc0ab4012cd7f507c828c1b8e6547422fb88bbe0a9
font_02_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 18572 bytes
SHA-256: 93dbab162e46e3f78807b16e91cffd605c6bef3328665e16e0c4d23606c35e69

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