Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d7689ddef29f1c…

MALICIOUS

PDF

110.2 KB Created: 2021-09-03 04:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62184a622fc6db4347dd3c11b50b507e SHA-1: 8fa469c48dc669a9acc16df78fc1b015d415b11a SHA-256: a3d7689ddef29f1c62b03e05cefab91ccceacf827de7adee7328697b5f8906bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=flute+basic+pdf PDF link annotation
    • http://sivam.pl/files/file/31718282153.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/22478618278.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/492f283a0f8daa0b5d01b17c4bd504d3/36814390217.pdfIn PDF document text
    • http://chapelguild.com/images/usr/kipiseremanajowiwagupakul.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609833ec3a915---vajisafakixurapomi.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/75651152160.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/purodisewesegorewinub.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/11b2e58830d1b1cbddb5026374223467/35085770490.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9366e5cd2a---7316390703.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d85c4cae2dc---85265149008.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/4306969360c2bdf6cfcf1.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a551483fdc09effa2402d3413f4d1176/vajiro.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/bikejowawurukiwaw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608faa8968c2f---6995905260.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/36333829150.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/h3cqnro3qkpkhm2kecq6m24i0h/gufolubo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/derusuz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d9330e4c2---49217507248.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9bf1d666b216463f29b0431660e679f8/71270103738.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/viwakedezixudekemuv.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/13807560285.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/67961660021.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_off00014117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15929 22280 bytes
SHA-256: 1cfcceeeb268b6091372af14877e241f3fa5490ae479ae702d5dec51e647f04c
font_02_sfnt_off0001939b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1939B 10504 bytes
SHA-256: dd074083af04166471cfaa97471f600b6b20897beb61fd3bf162e34ffe26d633

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