Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e6adb53bcc1141…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ba03cdd07a4ab0917033500919f80ae SHA-1: 67c563d37bfb2d291fcfafbe463d59a78fdffd03 SHA-256: e1e6adb53bcc1141425c5fb641c9503897fbb60a18de9e7c880813fea10ca0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe404fd237f---9915787606.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/a756d671ed742be2767879aa0a1ea3a8/54493708137.pdf
    • http://creaorganization.com/depo/sayfaresim/file/gexel.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af80db3a41735ddb0ac9ec679a755c50/jidix.pdf
    • https://mmszke.hu/files/file/xasapi.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a35669d72---bokanel.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/lobebigisunenazogebezateb.pdf
    • http://accessiblevehicleservices.com/userfiles/file/buxewama.pdf
    • http://camionespanamericana.com/userfiles/file/86499027451.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/121414e2fcea076f0028b0a064b841d9/63180034970.pdf
    • http://strahovka66.ru/userfiles/file/39736769406.pdf
    • https://et-auditing.com/userfiles/files/fevuvepexala.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/53317772838.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/4ed1ac3de0789d747718683157415d43/54924231424.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b42df484---jurulixaxajididoninabis.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/73e0882816859909bb15ad69f7d45c7e/90237076900.pdf
    • http://seoulsquare.com/userfiles/file/28447505320.pdf
    • http://casier-a-bouteilles.fr/file/57503712914.pdf
    • http://upbfassadenbau.com/upload/file/lizavudafawulepuxedalabuz.pdf
    • http://rustproofingottawa.com/userfiles/file/33743512096.pdf
    • http://maybomchuachay24h.com/Images_upload/files/11108112084.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f77d73b40f580b5e154caa470bf9c3a2/90797677246.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb63bf6ca---kebidemixebe.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/73c21ceed9e832d44c11b41ca605e3fc/72844063071.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93a6a53b5---34307049010.pdf
    • http://coumert.com/images/file/doposagofikijimilovatu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+write+a+resignation+letter+as+a+teacher+in+nigeria
    • 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_off0000f394.bin
a26f92298c5fd502af1302a7e60b368523563fe23c8a7f44f836aa696de565bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16504 bytes
font_01_sfnt_off00011def.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 16792 bytes
font_02_sfnt_off00013606.bin
596e200e321dbe935249bd891c7a24232330599900f1a40a63a4064330237750
pdf-font-stream PDF embedded font (sfnt) at offset 0x13606 10588 bytes