Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14c76e7bcb625e9…

MALICIOUS

PDF

87.9 KB Created: 2021-07-22 13:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aed342e78a8bac506c84465d22e1cb1a SHA-1: ffffaa779634b65b26ea3d8bb707d4afb10f2a73 SHA-256: c14c76e7bcb625e97bed358779e736dcf0ac952c0d324f88e2b9b85b2dbf1fc0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to lead users to malicious content or further exploits. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b399c9a68db7fdfad17ba09aee92198b/80768624840.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0756f52050---maduxejejokemoruvator.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/272565e10a11424b3cf941b45d5459c7/muwijikumojalijavazok.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/kulugajetowosowezumazef.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/15413404235.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608989de3d6d0---fivurisewekubetev.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1hhv4m3h6v2kna19kn475ocde0/10371077360.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/kujibetuputajojofasakud.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/vizijovixotur.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xepepukimitunuzafase.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20d3a5c77e---5737187440.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/zalaj.pdfIn PDF document text
    • http://flexa.cz/docs/file/tunejugimadavafofusizuv.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9b20e1e4633863c430e12df6613a0c5b/74122651616.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/86949030532.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bab34fcc254---88286206293.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/tipirikemapaxurofixiwokog.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/83174905756.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e4b96d136fad7cd28eba9a680cb8bb4f/muripavik.pdfIn PDF document text
    • https://aneri12.eu/res/file/8560656210.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa296a40b---bozafipawirabi.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622021525.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d4fe18f591a0a688dff71039a1c4eebe/39875352462.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/jptdcguk393cu0d7hfc39iocg7/wimorataxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=question+and+answer+text+structurePDF link annotation
    • 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_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 17416 bytes
SHA-256: 938808fe499175bf81ce593616d4a0ab5dcf5b6c63df07ef380a196cd04db7ba
font_01_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 10664 bytes
SHA-256: ee52727f0e3276f8ee53009a1950319cd3eb8673e96a987136777705ab043074
font_02_sfnt_off000138f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1