Malicious PDF — malware analysis report

Static analysis result for SHA-256 127d8e36c83be913…

MALICIOUS

PDF

82.8 KB Created: 2021-08-08 06:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f874631217b4ee37aa2784a6b1784f4 SHA-1: 331a57ef0285bed0b12ce61a604bff9184955faa SHA-256: 127d8e36c83be9130caa3ac2b046a003a35ae1094adb5e5577e470c8800a2f10
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/80351a6411b576724dd68abbf4bd9b34/98942171686.pdf In PDF document text
    • http://skolicka.eu/foto/images/file/47841281013.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/bajosuzadikiripesawo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092776ed201c---zamimemo.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210804130802.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30b503447---meferoxugonudadoxejexatu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7f7624c5fb61222338924b22f768658/62601970715.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e52b198c3---23478429715.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/kazepimiwu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f10fb964512---67532067863.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610800d9c90f5---61973063699.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/56039190345.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/f4nq4r5aob5005hjm25m2ttgbs/86281698619.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/fadabafaranawat.pdfIn PDF document text
    • http://co-mit.com/uploads/files/34294676592.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/57279067126.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/vixobopemizonapi.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wilabupamidatariji.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/loputasu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/98449878403.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/80183556883.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210607_1377774D81B90B9C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=primo+portable+water+dispenser+instructionsPDF 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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 11000 bytes
SHA-256: cea09b969c8e081c5096e8c7351235b1adaae32c9e75561dca0d20d71c778790
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 18172 bytes
SHA-256: 4d06bf79fe97de24f7c19b111c367b93d45d5f9dbb99edb18f9935c7aa12d852
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1