Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c014ae15ea21a7…

MALICIOUS

PDF

99.8 KB Created: 2021-09-02 19:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8319ebeba57b0e5fc59017edc7b3124e SHA-1: 366462761d1d07bef3b66588dcdb563227c74547 SHA-256: a5c014ae15ea21a72adf0a72fa80fd255252b0ba383c3e922f233d12ad32ea1f
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload locations and disposable hosting. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b48ad143d61---565219996.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/vixalofupebeveju.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429232741971986.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081fcd3a3e20---bajomala.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160731de90ed43---sikejavenaziduxapowalo.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/jikizabusodetosape.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2754775e1a---gikaremigavitixexid.pdfIn PDF document text
    • http://heatkings.net/fckpic/file/wegebiwuj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855b1a31b8b---18319074894.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210602_6394AF5CEE142F98.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nvk8t38vh1g59f6pr7ogop79s8/80430725712.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/72688115986.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3v1n4hu4kdl7t60hgvof9pmgr4/vafakazefemeb.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/radalokemuxulorodip.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///wezubigaxitok.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/86505704884.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bfk7i8opre1bitbmehms0aja4v/17022645278.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/33331028122.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fe2a43fc---getimofetuvegirajikivetel.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1cvgntoe5ehcpf6dcik9nn4su0/56524647404.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/64d95cdb8b98c47dc52d6e044d38f52d/ximeluvixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=printable+white+marauders+map+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_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 16748 bytes
SHA-256: 358054d87542e206bf942981360349bb75d137e66c245b45813585efa82b33bf
font_01_sfnt_off00015109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16920 10968 bytes
SHA-256: 761a3c4aa53798f52b4ebfb50b970ae05283ba4c2df24be05cce6583b255cb57