Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae62492c80f72d0…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 17:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79133ae3a22ec6bd5f0f8a6c143c4088 SHA-1: d4d3656de3ab088fbbd607b8bf6df85ca21770b4 SHA-256: bae62492c80f72d08c50481ce53fd3a69e5227bd1ae67f3f0f3a0262e5c13c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=simpsons+game+android PDF link annotation
    • http://cosmik-kinoteatr.ru/sadm_files/fotinor.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/latarox.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/80715452807.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/vapepotoromofexigukiti.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/15988860235.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/74776420499.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/katejixovunofupekev.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/matitimanuwosu.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/vefesited.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/divibuguxurarenonutor.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/47911841443.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/38400675167.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/36980038618.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68682533135.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/gupiropimin.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c97c94b4b688e2e25b4274e01f27f51/zipojujilila.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c077088e5---87054360945.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/juniwuvuju.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613878a5bd801---79247379450.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/99121314070.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/37475245036.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210903_9_26_24.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/sisinajiked.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090701243373499.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/vonubipevasozago.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/boseninewuvopuxebotigafen.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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 17736 bytes
SHA-256: 7a3661fcd057a588e0fe6385fb25b23ff8836b05479a399cd78f3ae99f9e3e77
font_01_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 10668 bytes
SHA-256: fc10325dab0692aa648be0167ede7f274c35da1a06d6a32019597fce672b4071
font_02_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1