Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de5fe2fefe43d1f…

MALICIOUS

PDF

76.6 KB Created: 2021-07-30 10:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa328f20d2e013f10639c07d42ec4a8b SHA-1: 42e1e30678c1501781cde419626d0394098b7ab7 SHA-256: 1de5fe2fefe43d1f3639e940caa1916976716de52552174f647469f419f88db3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of multiple suspicious URLs indicates a clear intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=xiaomi+mi+tv+box+s+android+update PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/aa9e0b2a44953cd233342b2f9a64c1ba/2620193220.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c7b1c26bfa111ed302eeef14e9f5e348/77343245216.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vsuoi3hq3j7q28pa7cmudjs1lp/9647633652.pdfIn PDF document text
    • https://bloomeng.com/uploads/46749495239.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9103a813---69051021526.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p8538dr1easonqfv6ltv5lf1m7/33136567738.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sizajosi.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/28311052380.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/sibalodeka.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/punapuxugofuxikuduwetupas.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/wutoresivatavesupa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3369b0588eb17d707cad4b90a811883c/69957472000.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/12907249f457932427eda8e3d0fdd008/17494796604.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/firilawer.pdfIn PDF document text
    • http://termocity.by/pics/files/muwakavuxiw.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/76494352046.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/083f08221e9ea32b7205f3c8c89a5084/pawuviw.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/sukawisumil.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/fizatuxalatasuw.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2898271c52dd7d79a86c43aad0c8e01f/sisuvudeb.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c589a4a6d71dc93943342ce8c243c29/pezivukuwe.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609614c118f86---xumiwo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3c138946a73a78685cdba2f0599730a0/poxufug.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_off0000c48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48D 17384 bytes
SHA-256: bcc85eb4aee096b9be25f83356ed801b980dbd9d81e0321e8a9fe545a1680cc0
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 10924 bytes
SHA-256: 8066eec6a897ebe39fd060f5ca600557dc5ec138f99551e21e1cf29e021624a2

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