Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e82e0c1aef3e141…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 20:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dade0ec0025359e690bf18e8334ee4fb SHA-1: 0b6dcec9e33fcb342a17223b117a338d65a13611 SHA-256: 8e82e0c1aef3e141713c5c3f16a8316b5aaa5729c5b7a77f8db678a46942c06a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://robertfeinberglaw.com/images/edit_images/file/62029665216.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/57637491351.pdf
    • http://scoutpate.com/userfiles/file/nenobit.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p3kphklu3kjp7uvpal1fjbutb2/98078575464.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/l0vt6s2ai31kfk8s8e30aoh9ua/kasemewebaxub.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f37670f458d544d230ceb498e9986641/lofegegelokusijisurabijot.pdf
    • http://gayaarchi.com/userfiles/file/20210626104505.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef00c04b67---nuwifovizeveg.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/i7a6ccv9846eou1e51ul1veohj/gogokadurupu.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf8045b42f---vujut.pdf
    • http://ithaca1962.com/clients/41687/File/galoxoxela.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0bffd7040---bizugozususejidib.pdf
    • http://galluccifaibano.it/userfiles/file/79159027073.pdf
    • https://mabuksusu.com/contents//files/37465955522.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/puromusawezivogeriluwup.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1b3fb84f159a8f234b097a890a7a41d8/gififofo.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5caf97347---womejiki.pdf
    • https://annjulieskarpmo.com/userfiles/file/1408295279.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609761d8034e0---nulosi.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d8e4da0445d3fd137292ccb3d8a74574/37136811141.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e1c2539338862692fc87140d04cee6bd/4507948609.pdf
    • http://evohome.pl/userfiles/file/74624227074.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf4e3bf0f---gumepazew.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ccf32c11---28455310209.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cat+not+purring+as+much
    • 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_off0000e7b9.bin
86c4328473eeca0a911a152772e78a5bfbe0f24b470ed1d837f032854a6a734a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 10776 bytes
font_01_sfnt_off0001005e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 16792 bytes
font_02_sfnt_off00011870.bin
ec6dc3eb35aaba6ab404aa182d22670dc8a9dddbcc74f872c6c01a887d1efffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 16200 bytes