Malicious PDF — malware analysis report

Static analysis result for SHA-256 1987aecbeebb02ae…

MALICIOUS

PDF

136.5 KB Created: 2021-09-21 21:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a92202f3d867b674a9229aee34cdb0e SHA-1: e070064c2be5d33eab726bfbb9864ce69a7ecce7 SHA-256: 1987aecbeebb02aebaa65a2afd6427beea23bb6aa19f756ce0024949f33244ce
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 disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ptairsupply.com/userfiles/file/32355978659.pdf In PDF document text
    • http://bydnjl.com/userfiles/files/84803155088.pdfIn PDF document text
    • https://msiutilities.net/documents/pinuzivufuwitojimelotefa.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/73331131523.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/mabol.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/95195433308.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161449d15c386e---75989196196.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/840848e4956be02d3e7b63f33c20f3a0/foribug.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210919230443.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/dejevejexe.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/u8moo1n2h0iha878bnpo84sk6r/bosesexotade.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kidefigexibulufi.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/54824839162.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mazitapunekazovotekuma.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631521789dea2.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed9368ea65---doxefebesu.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/luvufuwitisuguwuwiv.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/8677706144.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/puwedejidiluboveduz.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/37149620746.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/81158638781.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/88625899216.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/31291672540.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/86565018665.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c1e28570---10134086904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=prince%27s+gambit+read+onlinePDF 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_off0001a877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A877 10888 bytes
SHA-256: 37c76d3591326efed2a32c652d7dfc19d81167131e4c400d57ff93852293b27c
font_01_sfnt_off0001c177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D989 22532 bytes
SHA-256: feda6f5870b6909521f5798cc224000479723a42aa66851d7e9e8998416ce9a7