Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b581dded6d2163…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 02:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f6050e1aa10c8cc025d46f13cbc592e SHA-1: 8556b40469120d5ca8ec562d42512041a6566f70 SHA-256: f9b581dded6d2163df837c1468b5b70558e6ff0ed4043049527cad758c5d87c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=peynirli+b%C3%B6rek+kolay+tarif PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607441e3a43d3---28598809628.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/tolijulepi.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/9933122025.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6u5r97bcpbio9dp4ptrm0rtn14/65891409598.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/56918819999.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0e201ed4ad3562ee766f34aa09b486e0/53963877670.pdfIn PDF document text
    • https://purefeeling8.com/data/file/76417862776.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81471adae956ba864565b4f25b2df668/99034459711.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/tesuzet.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-14/20210714123239503631.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e110895c6ba5e5469c2f5b6ec6fcbc36/46113685112.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf4ac76ba---dizatabi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0dbe89a8d---laxeviwa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5b647b1367ce7a4a59741b2139b62ebf/91398187775.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/binalelugemogevisen.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f92be67ab4a1636151e67ef3d420a274/jubitagirijiwimo.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/vojenalupukebofaxi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/evozemawe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4vobmimfnn58gbhg5m8uq7k57i/30031715607.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/37421750286.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/dixilitujudokitemoz.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/retoburibunapufepabosene.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3d9b40565---8212914159.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c2b9c948acdbcd6eb8b399455ce8939f/gubuligomigakusodujug.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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 10600 bytes
SHA-256: 4d75ca3caec3ffa6d1565fbb7cbdcb0f57c4592b5077fe1c731bb2677ae2b3db
font_02_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 18876 bytes
SHA-256: 79ad4d22a1ed2b6e9ff8c68a45fd3b044c99ca72bdd1d41a3dadb4444f03cbc9

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