Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8fcf22776c60a…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 22:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 784332fae45bdd436ec65f43659713ea SHA-1: 36a7a94d848fdf2350458936bfc4a4ba1df101ca SHA-256: a1a8fcf22776c60ac22b419727448fd11ab933a3ec277ac566b8f564a7921597
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to drive traffic to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4eaddbd7acd2041612cc0fd5a5d26fd8/milijadizevuwemeleduxozi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160882e2354d81---jolerefinideso.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c4f6322e39c3d8f7f604bc2ee5b91983/zawemelimulebudibas.pdf
    • https://atraba-holding.com/userfiles/file/butoremofiwenikus.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2dc8c4b41c16a1416bc838b4ae46a875/72958783478.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b450fe11bf5---xutomezabojezekidozigo.pdf
    • https://rybczewice.pl/userfiles/file/51102695383.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b28be23748b---22998873097.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/afni6iell45n63sajs81vks3ki/lexodibiluz.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6d3601aedfccd68b445d6ea586c3cdb9/tavanodopexofinijasepuro.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b90eaeab0---29919026578.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cdd5996e1---23635851703.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/621310d873f01d0295e9c40c78c7501d/72949488065.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/665c52bc0d9a2daf85acfc79456a4fd9/tubonetubawaxe.pdf
    • http://boekenwinkelindex.nl/images/uploads/47780133355.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f116a5dc17---50357193568.pdf
    • https://alianzatours.com/imagenes/file/gorapomij.pdf
    • http://aps-mes.com/files/file/41289929899.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5cfae26d306d6f663d7fab2944fff7aa/81926813975.pdf
    • http://bogelaipigeon.com/upload/file/2399513099.pdf
    • https://moto-trend.cz/public/files/fck/file/rufuwenu.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c031db19875765db70c5d6b89331b957/ganepozopafanule.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91e5e7c96---bunixevixijuxofulinoradol.pdf
    • http://hytechplus.com/userfiles/file/21844331616.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fc1b848925bf6accc480b3de519d07fe/tejotajopaxureka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=commercial+vehicle+write+off
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f338.bin
d4f1c51849b08feff67b2fd00471ef50f908f86775770b2438e70466aced5b9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 17528 bytes
font_01_sfnt_off00012144.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 16792 bytes
font_02_sfnt_off0001395b.bin
2cce7df39fd411b132d1fe1febd751a603ac53671a22748672b179c27f424707
pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 10512 bytes