Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf17d801f5bf0734…

MALICIOUS

PDF

87.1 KB Created: 2021-08-15 18:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1358734fd63e1647f599b4152ea533e0 SHA-1: b1e519f3c02395d306715184201c9a45cb9a19e8 SHA-256: bf17d801f5bf07348aa7d7ebe4ed1941d05fca21fa36b2d0b0c1fa3ce80dd15d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=evolu%C3%A7%C3%A3o+da+administra%C3%A7%C3%A3o+p%C3%BAblica+em+mo%C3%A7ambique+p%C3%B3s-independ%C3%AAncia+pdf PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/39973154505.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b80c38a8bb---48150956418.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5e575d5a50618cff8790d18446e75d1a/gakipoxafi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f289b3b35---37063973000.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/ziwuledukajix.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/ratudolonoxed.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4a78748330970a2ad7421bcac9c56731/levesumijide.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42de6253c---sugalavolodul.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/pagixoba.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/rirobefopufu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2390f4a092---19562326427.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/jagelugunususujapusir.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c874293ea---1132656049.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/94365626504.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/55349127915.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/68159511482.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/dakunur.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/fuwetunusowaxudaboderipe.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/ripojasomexa.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/88687808278.pdfIn PDF document text
    • http://computerdoki.hu/user/file/65888085887.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/rs2vqjj89nn6j09rvbrvbjasnl/nijobegotewudidut.pdfIn PDF document text
    • https://ancoraeducacion.com/images/18212359239.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7f4923adb75f1aff8d75bcbbbc09742b/8758819692.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d51ln29bvbu3lj04moq4fanom1/bakudob.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_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 18492 bytes
SHA-256: 4403d448467a437443605e73805396d00b046f5cf3b4c735c59027ef4b182ef7
font_01_sfnt_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 12128 bytes
SHA-256: a9972b8a1607e93a6a9e8d317dc6345dd00be79ccb4bac056540b3fadf0f6f32
font_02_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1