Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56dd094590ba492…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 15:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58cb822c271aa618ffb9c097e08ff18a SHA-1: 723c8cc8704e4feb63cb491453691cf20ebd2fe7 SHA-256: c56dd094590ba4922d15bf085402523be2fdb0872854433b0d06d19250ddcb02
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=manual+inversor+de+frequencia+schneider+altivar+312 PDF link annotation
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/77436603838.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gesix.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161005af52e525---18119229738.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941cdc07d15---lalufijabenizemavis.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/gibot.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ab49a394---51383815664.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fccfca791---xipowukuvewolo.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/xulareba.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/movobomewajejefimisep.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/59083711837.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9973649f6---18868750517.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ff2759dd---58162533231.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/75905027731.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/45251636307.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/fidekazeti.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/1858593712.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/3fc0a4cc214831dc8659e7755cb09d9f/40721523976.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/kifudafisoripalanimixeda.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/81cdbf5dc7d3c371640c21624d2e9269/39651642626.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746753c2f85---883072707.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/44401425359.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/49975917414.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-15/20210815064743787864.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/56165980491.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/56483f91a67608d1bf2d04f6ad20a6ae/fovemepodutido.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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 20168 bytes
SHA-256: 7e4538c88e72bfd9a5c82e6b5f948725039b628c15c68a0121559331e4fea48b
font_02_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 11224 bytes
SHA-256: c4ad1edf78e74d10bf538e5de48dfdea14a01acdb98cacd9787a345600102b58