Malicious PDF — malware analysis report

Static analysis result for SHA-256 9615613a8d9f6bca…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 18:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97e3aa26dc9adec262e59189f9600ba2 SHA-1: 5c163b502378caa6b70c3a1ef3a58ab4fad8b240 SHA-256: 9615613a8d9f6bcaf58a916e6f45a576dc0d4a2759873aff68dd608578039bfb
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 are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=best+game+like+pubg+mobile PDF link annotation
    • https://tahitotfalu.hu/ckfinder/userfiles/files/37761498057.pdfIn PDF document text
    • http://maxbrio.kr/files/files/91113226874.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/nikolikawejewow.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/xewamoperisar.pdfIn PDF document text
    • https://pecsikult.hu/files/file/16175323608.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/vakoted.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141428289902.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/73962199686.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/25758768891.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/doniluvuxuroloziluw.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/ziliruk.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/41363153888.pdfIn PDF document text
    • http://eichler-kammerer.de/24858319872.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a105403be---maravogibo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387d5ef3c7a---jibosudevozunibobarap.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/80869804797.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50ef98b34---74732758435.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/26341593377.pdfIn PDF document text
    • http://sial.pl/galeria/file/sosazalol.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210908034614.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vafikovupiburiwonod.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/92487804233.pdfIn PDF document text
    • https://adikmanis.com/contents/files/jerenozuxatenigejexifab.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/togorikejuva.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/73441388453.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/94567472811.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_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 17224 bytes
SHA-256: 7e177cdd853bb338418e13cad1af3923a8432a4ff5dbf459bb5a3cddac6e3a8d
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 10776 bytes
SHA-256: 0dcd59ebb5beac13b1f10edc52cf82b0a0f5278b84dac580c55d84c8242d0094

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