Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58ccc7780b39cc9…

MALICIOUS

PDF

85.3 KB Created: 2021-08-03 23:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1807c8504369d9d7dbc1b918944eb01 SHA-1: 83e8b638d09ac5e613d1094206528e2f9bca465c SHA-256: e58ccc7780b39cc9fb0b020699f260ced3866c6fbb9c060ab661de97fa7e15e1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters further indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c912dd02327---bulabaziliwapop.pdf In PDF document text
    • http://dentalweek.eu/userfiles/files/tobaz.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/5fd6b5ce5789cfc58a408192f9339950/lulejip.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/5939153522.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/80a663701f728c8ceeb8a6d97089c678/13255922625.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fe0d7d6a53ab3a5a10c4e20fb529b0e0/nozevilagasoluziwi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc220c1c9ef---27898726976.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837e5e82ba---vebivana.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa97a8128---81240392785.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/fafaterufenuxikom.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/tuperexekujupegomapuge.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/86618575596.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/lafopovizidetobikegipe.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7uf7jmq46i7i5ckf3fjutcunt/nemapogamaxo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/o2i5jb2pnjmkbktc4qdkneapht/poluzaxuraxeru.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/81566534028.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/5pj3h5j6n9kmtuc6j8k8k3fn84/61665200792.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lgee19q1tmahvahgcfpjfhggt4/44237332326.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/77808174375.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/dpqr8rkhkj8ci2ev5ifhslh7o7/zevowikapaval.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a93372ad70b---nanisabavizasinefazu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/sutavepel.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d94a898aae3---musifigeja.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/94282759457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=conceptual+framework+example+thesis+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 19236 bytes
SHA-256: 88699ec5508d330f0f0d02b383289ffa0e58a699493da9e1bcd81d0c310f8148
font_01_sfnt_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFB 11296 bytes
SHA-256: b28c3124300f7912c635186617b83a7d53cd0bd61f5aff70e84d8e37240fd91d