Malicious PDF — malware analysis report

Static analysis result for SHA-256 764f7ca8e3ae43a0…

MALICIOUS

PDF

92.1 KB Created: 2021-08-29 21:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d9f42f8d179adcb98812d1990571cf8 SHA-1: f7f118072ab4329485ccb7023337e2bbbb12d957 SHA-256: 764f7ca8e3ae43a00931a86fd997b38e99aced9b05d631af1ec0caab02da465a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=watch+promising+young+woman+movie+online+free PDF link annotation
    • http://vytvarnyobchod.cz/UserFiles/File/rexuba.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/19944327231.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/jivigapemedizikewul.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/dazemamamomelef.pdfIn PDF document text
    • https://aedwea.com/upload/foto/65007252970.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1f28012d3---31442552408.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///1242830822.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/151876010060894e4602736.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724fc22b2c0---15559848110.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ff14aa7683c30f484a4f8449344bf858/mifezu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e781b9e9---pevunitigub.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/kenaduzirikexejolaw.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/85181588500.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9ba48522---libexosukuked.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gogafeguwedomiluka.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf70501b745---91404398167.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/favunopatulaxegunepur.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/68504073956.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/turefer.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece7232555---rimanutarewekibab.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4b2f59fc89ee72ab137920ac0648e85c/zogala.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/dubujixaboraxalu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65f89b0894---89804744615.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b81abae5---43964440361.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a782adecf9b---48026546037.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_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 11288 bytes
SHA-256: cc3216fca2cd128149fad82ae77916a379a44a43d42b7257b54c208a019444f2
font_02_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 17596 bytes
SHA-256: 93b514b35e179da67ac47cd5375de7ed3e564b397fa3f2e3d61ad337e91489e3

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