Malicious PDF — malware analysis report

Static analysis result for SHA-256 caacc889828ff313…

MALICIOUS

PDF

73.2 KB Created: 2021-07-14 03:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e3ce5a6b255c3804eed663f38553c4e5 SHA-1: 8fc04943dd61f7c94950aea74059009542724970 SHA-256: caacc889828ff313f8a4cd5c94bafe689b7cc98c5ea4b7f8ad3b2520257d4ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=intercurrent+infection+meaning PDF link annotation
    • https://nguyenhungstone.com/uploads/image/files/xolulepusisumizipuwezesu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608007d99ac73---paduvipojafenikipuw.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6567d1435---fuxenuxikifuliwiw.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4d325c0d---61473026874.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c60f1ff42d3bca2a4c97bdd16d7ad8a/luruwesejevesofusubuwo.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/pd0rl50hlh6p20t2qleed0nndq/jotamabimiximuborafavu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/bf061f5eb23afcac6c4683fd0a320eb9/41995385046.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160821acb51e7c---93097453162.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4j58cvnbecd9tm2jpdhc4j0hlb/xalozuwobopatesajig.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fd2092f2---wutakagosig.pdfIn PDF document text
    • https://davaocarrental.com/images/file/dizosinusijepi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/397e8992e57593297f5d6cca640dbdca/38005947469.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/sarajobefonugagugabut.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83e4786a9---43763736634.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba300a6b18---45413371555.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/duzimitavukixopa.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/jinajekikalexigajuxafi.pdfIn PDF document text
    • https://inncredel.com/uploads/83723428394.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nj8eiaqhc6952v1aedth1s5b71/kigijogigiveberexepivag.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0l7vas8oij41kbvi9jhmek9tu1/tubabebisawoxixawemugo.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210703040910.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/naluwetetebapizonenukaf.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/b1f66a99815d7a60773e047ee812d95d/modevatopiwate.pdfIn PDF document text
    • 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_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 15892 bytes
SHA-256: b22d836b3b32d3a58dfada22cddefa3d47d8f536261bff0dfdc493fab485c365
font_01_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10516 bytes
SHA-256: e3b96f192bf3dc279d0e0de70b7c6e253228ec19364d756469497b7c2c3a4c07

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