Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ab70c254eadbc2…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 22:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84abde11454194e2a6023a2f1d4c41c5 SHA-1: 918d05cfcc97246a7992996a598861dac0688f88 SHA-256: f1ab70c254eadbc2afe7f6799066841ac8f26f74a7bfd18e2fc32245e43607c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The 'SE_MFA_LURE' heuristic suggests it is designed to harvest credentials or abuse multi-factor authentication. The document contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://kanstm.com/ckupload/files/45182743357.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c1b2a6225a0d850bbb0756dacbb3353e/zisababakivagakufaliki.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/13471266641.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160866b62d1925---71840540630.pdfIn PDF document text
    • https://airbays.com/userfiles/file/91863589912.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74041718412.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/add3831ea0f2f3370024a528e2d6dd82/62488390608.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/15hrsvkqa127f5kap902apnuoh/zuluw.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c9c4c43f---fizod.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/f849fr2s4vvv5jbg6ia918idp9/xevafapokota.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/kifufaromezapiwof.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ae9483c23c2127c63aad804b650c8a1d/titanefiberixowojogolal.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f68b4cde3---jogisag.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/9669113119.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/21888883054.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b77f2a8a---24718713779.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/rozusepaxotanorod.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c71ad1642d6d2f98d4340c362b98def2/zozepadogipuladizufo.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774eb4f0aca---35260494184.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609cb9def1723---dejumir.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6bd8bf2c---migetapafulitazetadutimi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc7d679d66---20735027071.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3b360a77---tirifolojokinapabovo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2faea135---vewatinepotad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+erase+a+text+in+pdfPDF 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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 17408 bytes
SHA-256: 36ad59b3ee2456068bd55dbf37d714d02d245458e8c8124be7ad2af905db476e
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 10624 bytes
SHA-256: 90ba2a1c31ec2198651e4a644c60f3218da0b13a3e06c97e26789c05e5a43707
font_02_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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