Malicious PDF — malware analysis report

Static analysis result for SHA-256 f559668a75ebd213…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 20:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25b63e02ac3e19dbb69f24ac5765892c SHA-1: aabd1fce4ed72736ec394d7f1a081eea240a13de SHA-256: f559668a75ebd2133336dd5f77bbe2234c6cacaeaf85d9f5518764ea43f2b723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised WordPress installations, indicating a tactic to host malicious content on seemingly legitimate but compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=mcc+english+guide+2nd+puc+pdf PDF link annotation
    • http://highendschmiede.de/highendfiles/file/tuzodisesutewefo.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/mazuluvexovipal.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bmp5upq499bum2pbk2d52nb0l3/panupepufapuliwixaxi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a54a6818---18517310065.pdfIn PDF document text
    • http://naviway.su/upload/files/fibufasimipexumineku.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/62882828955.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12687361687.pdfIn PDF document text
    • http://dade666.com/userfiles/202108file/2021081906001670554.pdfIn PDF document text
    • http://vtaky.sk/media/file/powijofo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088207e2687d---82899089259.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/vidifomupepubuninulene.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/45988456016.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c0b13307---25960147736.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8026f79d11702c496c9735075fd71fd0/zedudokagotegatijalivol.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/29867937169.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vodamipesagajedogif.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2oul59kfl10m5uvvjl9qa97v6m/doginirujekono.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/11010573429.pdfIn PDF document text
    • http://myredm.ru/uploads/file/32858931715.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/11773067666.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/karil.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/lununubegevise.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/13044409245.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01c46fad2---kelaxufareso.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/korajizurixawin.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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 10632 bytes
SHA-256: ba2d3e77bc319a33e0711f4ada98de1ce979ff42e4e1eb99d58f8b73e89c44e0
font_01_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 17688 bytes
SHA-256: e286bade19be53bc3893f43cdddec42d0b676ee4be23003d026934ebf9d73004

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