Malicious PDF — malware analysis report

Static analysis result for SHA-256 580728dfff3b1296…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 00:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a4bb838160680bedb1266153b1e4c0e SHA-1: 1c696eaa2aa68d38bb7e1923dd5800f83a8dc188 SHA-256: 580728dfff3b12961848bd44430edc5b240d5ebb56e49ec4e026a3d01bcfa504
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to various compromised WordPress upload storage locations and disposable hosting sites, likely to host malicious content or facilitate phishing. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or scam attempt, aiming to trick users into calling a phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://prefinancovaniehypoteky.sk/res/file/rukugexatewigewutalelejit.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c526ead9bd0---budemud.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7d8dfa63---12614043195.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/sekafo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/jewimelivorumokikinev.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bd4dd64a35317fc37809106965d5e4a1/86694211638.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2dcf6fcd9395537542ffe6267513a4d4/jenamonunurudatejeko.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/tivadimenakosilot.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/15299295149.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/rokirevepijeze.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/69892524908.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/20157161968.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4385a6410---dabaweluwusinapu.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/68291767239.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-29/210729144241438680vrov04k5s8gz.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jisimebibinivetedibifom.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd9f27c85---57925611913.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a25cbebb3---biweguwubobozosotigusi.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210525085028.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8be2041789285e6c41aaacf3b3592006/riwado.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9cddc69bd14cb532e562acb10309d2ad/nusosibibolaz.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/27uf5rc29qsipt8ebb4bem4c76/kowodalujogewusomotelefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+transmission+remote+starterPDF 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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 17768 bytes
SHA-256: f4e3c99c09356aeecaa6837eebc030c720051f2603747945c74d735b1a4c82eb
font_01_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 10364 bytes
SHA-256: 93cae5f1b9f438b78b5e7dbdb9f33496707077a02d6f0d38e81b42d165c51c17

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