Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b769bdb6479333…

MALICIOUS

PDF

90.3 KB Created: 2021-07-28 08:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41ad8c1aa9b14287fe05f15dec923fa4 SHA-1: d6b3695b3da1ea38f1b57a5ae7198f4da8866677 SHA-256: 61b769bdb647933312945ed0135f0278faa4351a401425d40db0b5eb95e59d8e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c54d25ec816---rudubifak.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a4ed38b975ed852fb492755144a1d97b/fepuwamowipefenufurol.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243bab4be7---buxinaligezatezefix.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a5snkbemk8kuna14feac0lneh/89737073403.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160832ace9851f---73001953038.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fa29743e---tuvumunotesaturelerixeje.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdb6e8ef8---tapegisixunifapilijotix.pdf
    • http://k1a.ru/images/files/file/likotamu.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dffcef6c8---mudunodawigat.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/limowitaxupeduduzolix.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60FDDAA6E48C4.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716054cca66---rasut.pdf
    • http://nensi.si/upload/file/notowolorokuso.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a9f37a109fb452c186d4c495be260392/jiparibizivep.pdf
    • http://studiofranzoni.eu/userfiles/files/jonorakajafojojok.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f7f22cf6---badak.pdf
    • http://citranco.com/users/files/20901580989.pdf
    • http://t-p-fortune.com/userfiles/file/vawudobab.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/db0a2a2dd43f1eb3a10ab75b9525af04/razuzofa.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bccdb0645---88987825499.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1agq06vgifs8v40kg5puion5j0/47891197955.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160943d805fe94---rusiwerorudisuja.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/474gihuprp13i33sriuqhp2kat/10291814092.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ks4lsv3h8voqc4ropdsisqsa45/kipasubunorosegidin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wwe+2k20+ppsspp+-+psp+apk+iso+download+for+android+-+ristechy
    • 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_off0000f94c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16792 bytes
font_01_sfnt_off00011163.bin
93bbfb23534407fe3ec72c7a6037db7bc92671121420523584191755a3f12f86
pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 11276 bytes
font_02_sfnt_off00012bfd.bin
adf1ddbcd6c13ed3ab44e1d3cd06cccc7b4c217be7651576c77785573366681f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFD 17172 bytes