Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd72f184fdf2686…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 19:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01e146c79458fe6654c2f9a2e9aecd11 SHA-1: c62bcd5cb16518319442dc2dc184f73a965318b0 SHA-256: 3fd72f184fdf2686de01a23e6a9ed45bd7a06672ba3bbea7828402e1e392ca2d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=software+company+startup+business+plan+pdf PDF link annotation
    • http://formel1vermietung.de/userfiles/file/96042436824.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/raguvexa.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/10231383398.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d428bfb0ba52bf46272eee5e0bb8963f/56028859070.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/53541326054.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/bifukip.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jetavigiwuvawawatetovaw.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0531059f6---lijakizo.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/lesabupuwakiro.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8347fb18mc60m1qjami44n8le2/melut.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe41681799---duputitewo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eead83d391---55694510246.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/77778096205.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba53ca234c2---lelaruloketenas.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc15eb728---lutifuribegerirasap.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b556837049163a4cd81fa0c25e107da9/24656557451.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/64449495364.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/80650574846.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/46222813211.pdfIn PDF document text
    • http://wohingltd.com/userfiles/lijido.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/30729231627.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/pixizutaxevozukuwekurosut.pdfIn PDF document text
    • https://bursac.net/userfiles/file/pufabitafekupagonolu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/35299966757.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/6835113019.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_off0000c0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 16508 bytes
SHA-256: 1956607b8e65e7b9dba86b3395094f118a5027f722ebc785b2564785e5264919
font_02_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 11296 bytes
SHA-256: 0d3543942bd93e2f0ad5c739552e23529676c63787a687280834cb95dad687d7