Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b35b5c85095abb6…

MALICIOUS

PDF

88.4 KB Created: 2021-09-14 01:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5fb656eda7c7e566262dc4ef32b06286 SHA-1: 7ab267379fadb34589c0c2625c403f89bb93da56 SHA-256: 7b35b5c85095abb6feac9184270d0e5708cf89dbb63d19a4c8cfd263e5fb311a
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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 http://baharev76.ru/userfiles/file/dokevozoriganegevome.pdf In PDF document text
    • http://theflowermaker.com/uploads/File/79447627057.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/64863053937.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/sofutenije.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d693856b---67115343001.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/namadusej.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/deboruj.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/28847360227.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b46b68b2---zuginulofizef.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/tadewilomotuxorulifa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138651373307---83254512571.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/nuvewurafujumiras.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/77106859813.pdfIn PDF document text
    • http://trevorhannant.com/77929906071.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df25c554ea---27603019512.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/18208205949.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/patogosuzemaj.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/88353199484.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/96225217335.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae2dacc57---tetapudoge.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/wafojuvezoguzovefavonoma.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5e562873---39983463773.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1fdb62ca---53057365537.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/memare.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/87852876219.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/84406771504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mutant+mobs+addon+mcpePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 10668 bytes
SHA-256: e6a3326fad3c4211602ae70e600bd959b938c4bf24b4c0dd73a0f733801f3dd4
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 21948 bytes
SHA-256: 05bdbb76f0ae77667c2d7c5b29b892fa715f21e2060985c6350c91b646cb9d5e
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973