Malicious PDF — malware analysis report

Static analysis result for SHA-256 31caa55cfac4b012…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 09:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 057b6e78ffcb5815bb71c4f19cb9205c SHA-1: 8da3c7098cca4bdbbc517c8915420df71e80c6b1 SHA-256: 31caa55cfac4b0126b4a743054cd1d81cf3ce8bf7957225ea8ac8fb18be8720a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to distribute further malicious content or phish users. The presence of multiple external links and the compromised CMS upload detection strongly suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/l08qtih6hrgdhr72j2psindhat/65665489222.pdf In PDF document text
    • http://attlas.center/userfiles/file/49936974544.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a449f3b158a---zuwamobekexomofetebezan.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076261082bf3---wabozirog.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bd2edfcd---kebunexomudirepabum.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb73450d43---72676299122.pdfIn PDF document text
    • http://matras-devison.com/upload/file/33189468970.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c73219729---74476235480.pdfIn PDF document text
    • https://tonitomov.com/picture/file/zojudupijujefujipawiwumi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kssuqmm9d7sv0glk90o1uv69g3/zekateluxuvaburazajonu.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/burikidid.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/waxuwajejifiwirikidak.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/koputinapapugigegojurowub.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a56e1267e---31341624856.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/041003691c8f9ee0a3762350f10dcbfa/rifazu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210526125239.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/48948867740.pdfIn PDF document text
    • http://millecolori.it/images/file/fewedikelilax.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/594bdd58a1bcceef473d006b5fdc5bca/fuwipixufufobolererak.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c471ce9c69a1a9be5509464bbbb96fa0/mutadegif.pdfIn PDF document text
    • http://ruihuitax.com/files/file/wutetug.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vck2n5s4jtvqhautt7beb25925/96537368835.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/941a3d7dd87454fa520808ee825ca203/48834448879.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/96512843094.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715825546a2---zusibu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fusoloparujosa.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7297a6ffd80bde7920f58fb7da237e85/47470410401.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160999b683d2ee---lenaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=2pac+until+the+end+of+time+mp3PDF 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 10912 bytes
SHA-256: 8d10db36b6f84d03b6d62f05be53356dbd18659e41292ee5f8b807d077722983
font_02_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 17988 bytes
SHA-256: 63cc6890766b87071ba96c294f47bc8fe5db6cbb21ac5cd6f07294647bcfaa0b
font_03_sfnt_off000142ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EC 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f

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