Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf2d0461af0186d…

MALICIOUS

PDF

77.5 KB Created: 2021-06-25 18:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 604d0ab2f885bf95e422144ed6cf31c9 SHA-1: 92fcad0be9e31e4e6b5e730cf7c661301dcecc96 SHA-256: bcf2d0461af0186d059c61588ef8409e87ff8a4d9ae965a5fc77c83452217721
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the overall structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe652ec1ce---zovodiwexogunimiworor.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4f23e158fa5f0cbffdc706120835cbe2/52047032033.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5b0cce57d8ee597e00087767ccbe2b0e/koburulixelanuxivonirafi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/27250c64c3a0e6496c2c97fe6fee4a1b/xowiwasum.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jd4643a5cevubo1928jgcshroj/natugasowadijub.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cb7hegc1uqe6a6h7rioougs062/18084641496.pdf
    • https://sieuviet.net/webroot/img/files/dudopuvizarorukodebanif.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/59388db37b115a0d9970536ad982c6aa/61261758903.pdf
    • http://aaaexpressac.com/userfiles/file/73634783970.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qla169seidtarv56m8e5j4rnh9/2954202053.pdf
    • http://asupuro.com/user_data/image//file/99550389565.pdf
    • http://seamacros.com/upload/file/jinajumogevapox.pdf
    • http://jonkmp.nl/img/cms/file/burisowoxidojive.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/47659962235.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881bd333290---85441220672.pdf
    • http://teenaramainc.org/clients/875997/File/wupumin.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16095fb3b033c1---figabip.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/50b6572f3f2e32ec50382c57ec454377/dozoxekapaxelupegir.pdf
    • http://c-amc.com/upload/files/23854765207.pdf
    • https://easy2ticket.com/upload/files/rugofamojirimixes.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/kuxilu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74cc9a530c---79065013029.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n5ttrejea6pic8kp52ka57mm75/11569222194.pdf
    • http://energo-winstal.pl/userfiles/file/zunovivix.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/65abgspkggsd2un9rr8m4dhem0/45233241208.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rower+br3010+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf7.bin
b13623bbf42a60f617b3a7f2a6d9cbb3bda4c480c75cadf787ce0529aa970788
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 16908 bytes
font_01_sfnt_off0000f722.bin
dc979a8042815079f4287f47c48e1af7dec012e03c479c07634d9dcc0c1b7968
pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10628 bytes
font_02_sfnt_off00010f86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 16792 bytes