Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75b34f63db72882…

MALICIOUS

PDF

92.6 KB Created: 2021-09-12 23:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a266fc3cb55f5c5c828f297f2fb3a29d SHA-1: 0ddadf13c6f4993f5b31e3755d04476fa4544817 SHA-256: f75b34f63db728821165b6885cf1803c37d777247e5eb820814cba84bcfd4e54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many hosted on compromised or disposable domains, which likely serve to direct users to malicious content or phishing sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://emotionpicturesfestival.gr/userfiles/file/50115873773.pdf In PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/solumobukenikasifipubad.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75a862f70---10437316739.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lediwabituw.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210910_F42A82164B2F8B5A.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/rorizuzusimotowokomamozed.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gidewaz.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/91216755293.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/vunerigujuxeti.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/zifajagimodovabimuj.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/dapamabawajakin.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/7780888782.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/98101089887.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090110535976.pdfIn PDF document text
    • http://kaies.net/upfiles/210904074944992386w2np50.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/99501475946.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/69008150482.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71275e36b---29641148056.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/megin.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/70648426463.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1852f5c0f4a06204bf13595b650ab975/4691243326.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/rovaso.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/foxiwapoxoti.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613997deae680---51294877114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+change+my+android+passwordPDF 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_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 11008 bytes
SHA-256: 4d5ba6b1319dfac1294e6d2093849c9ba7ce2a788498e36a847ae63a14bca428
font_01_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 18504 bytes
SHA-256: 8eb0c12e6fc0624d70588d7feeee4997de7eeae109de84bbd5634ee0b841393d
font_02_sfnt_off00014d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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