Malicious PDF — malware analysis report

Static analysis result for SHA-256 3511a7c60243a330…

MALICIOUS

PDF

112.2 KB Created: 2021-06-26 11:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fd07c3942a1c02e3b3e956a55cdd9791 SHA-1: 1edc8e151ebc9b00b2e0f69ff455a54bb19c205d SHA-256: 3511a7c60243a33009328e2047db7fbef12055732effdfd7e41a5786b849280d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8b082422---xesej.pdf In PDF document text
    • https://mamotato.ro/userfiles/file/ferapazazexalolopej.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/30514ec1e2418176325fbddd089c0075/gixudikipo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qqb4ekqklulrojkatdjcspi1rj/30412402779.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f5867421f49e5b387fbb650b26120291/56558373201.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/kosoganifarekemivezafika.pdfIn PDF document text
    • http://princeverma.in/uploads/files/pigunizajisifej.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0224c07b1a6635fd033fb3efd3f0565c/vebofaxadasafovofij.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b75b31674d64c0b82b65741d693b9c25/39477824118.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4b4d1cff5c8da68f17da3547a3b5a625/ruviwisufi.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/mitugiruruxawepedewud.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4627a8e1c1---jezofetufonegiditibidu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0034f1541---weladoliwasekum.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af6776dc8b0---25866628235.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/koxiwuwerevojabel.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/35611795902.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/55026099150.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jasofitelejufixemom.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3fbc8095fadf82bd5600e5f3e3aa565d/niwefunamibatiso.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/700c1fc0ce7504268cf6da0fbf528d34/37224437065.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5c99f584---27758371346.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7c8ffe9df2e494985150fe1b38848bef/34113276591.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae30b76e---gunoximeri.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c59934e2ef7---zodibewixogusibeba.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838cde640d8---rodaresopinaril.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/51957377978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=from+the+passage+it+can+be+inferred+thatPDF 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_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 11136 bytes
SHA-256: 8725cf2aa6bd6be04596a5d3daa422da9b7e07a5bc97c3749fbfe40f3d7d6311
font_01_sfnt_off0001316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 18092 bytes
SHA-256: 1255e7174c968ce8ea6c87a8e5082675bb488b106dac1d1b3a3f5153395ef2b6
font_02_sfnt_off00015f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F33 19844 bytes
SHA-256: 206998a10e3392107b34654c3a1ed5f7eb879821b99a4e1544052bf36c6feb5b
font_03_sfnt_off000198ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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