Malicious PDF — malware analysis report

Static analysis result for SHA-256 213116189d465c44…

MALICIOUS

PDF

95.1 KB Created: 2021-07-03 14:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e037098058db3f93ef235dbed83746c0 SHA-1: de9d1d66bee8e64205053834747934b0a2713950 SHA-256: 213116189d465c44fe2d03202b585d18a8d6a8a957e0063ec5f0b252ed5b34f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://smidgel.ru/uplcv?utm_term=hd+movies+apk+free+download PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cead593b743e80f64d29841a48c36f96/kojepin.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/10379123772.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/850ef1b48c2f3550a796d21c910e6af1/50352592381.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b13644c853cf9a2a217c076214c6ea4/xurezejufukesepovedo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a4b3587cbbda66038a86ab99e666cce6/mawepujetapoximugamoz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf44b5375---39274738888.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cbdc6b9a8bdaccdf093f3ae438a52aab/negefuwewovutuji.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/56775146872.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/72549336877.pdfIn PDF document text
    • http://strandedtattoo.net/file/konekedakosenozunugakowi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rifiwevapisekir.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160856c59bc39b---kudivigipidevo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16090793b32fbc---mujadiwuvafajofapogiw.pdfIn PDF document text
    • http://schokozentrale.de/idata/62661269864.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/41497019553.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/pewomapoxir.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///93349030687.pdfIn PDF document text
    • https://loctra.net/userfiles/file/rulajumowekezaxivumexut.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/75e5622c94ba44cc941a00588b2b35af/48995268981.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6s2187girem7gq3qija9fo5kse/16611280141.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/nisidazarowusotawubofax.pdfIn PDF document text
    • http://fxmeat.com/upload/file/80dea7249ffd6d6f8eb1cb6b83c54729.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 18928 bytes
SHA-256: f658553d1c3a70e40b4ae9281e0840a0fd0d48e65a76660461fa9c49abf75f93
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 10796 bytes
SHA-256: 05e4a197c19b2f7ca423955991c1dce76d2e10bf6bd4a717a55600cef84f5209
font_03_sfnt_off0001428c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428C 16860 bytes
SHA-256: 271884b8ac87b4654b76c0bc48a9ffbfb430799a573aebc3c1cb17cad57d9789

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