Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fa2514f760716d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 09:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84eeb3e84034f8f72be0d5615d5e0f44 SHA-1: e6d9444db11175b31f88da23e6b0a079919a6b8d SHA-256: b6fa2514f760716d3e9d4fb1e36e9bb4c85a2e549f74bd057edc613fac45cc19
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body was unreadable, but the heuristics point to a deceptive use of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://barrier.exma.cl/ckfinder/userfiles/files/94987031937.pdf In PDF document text
    • https://futurefacesmiami.com/uploads/file/losetobagasetav.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/79112385325.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090613502273499.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/51190962039.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jafume.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/67169448756.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/jezamusarumebutofud.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/kitubulapujarofaxebudojo.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/91731523416.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161301a41d9ae6---31514962139.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614190ca5ae09---rakojitomefexabepimira.pdfIn PDF document text
    • https://clinicscrm.com/img/files/22379472111.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/pibapekusidov.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/17187616083.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/gixegezebapomowedavabode.pdfIn PDF document text
    • https://datenglagi.com/contents/files/nulaxuwez.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/bujoluxeluk.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/34615572906.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/rukufo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cda77116e---79012157428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=penny+jordan+books+free+downloadPDF 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
stream_004_off0000f1ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1FF 17820 bytes
SHA-256: b6f59dff79973cc9eff4edaa2db6f821ca8d4ff4a07c2c763d322b14a545b934
font_00_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 17528 bytes
SHA-256: b3210fff1bb13ec4464c7f134077bb467da98d14a5bdd3fad1e1432862049aa8
font_03_sfnt_off00013ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 10720 bytes
SHA-256: 0540c435b680687f7fb8667a9fc388889e1c350c9a46fab3974d9cd66f880658