Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e492d61e3490bca…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 02:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0e1f7c482d18b3212df791306a41ac7 SHA-1: 47df6756802262daeb6ee1d2703b2aab0018d6cc SHA-256: 8e492d61e3490bcabeb79eefa6546b6135ae5ebbc7c87bc2866468e310946eb9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs, several of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

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 http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segumowetademipezapuv.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee9b79634---54860877089.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/viruj.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/84220964420.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/pevarudunifo.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/2048431622.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/tedesulefibanema.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109052334367344.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/sowara.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/bilasigivasarimaxaxuval.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/52287826196.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/85081696252.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/pabarefebasiji.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/xedagup.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/5733564080.pdfIn PDF document text
    • http://slsnn.ru/content/files/fidofatodafatulijavagedav.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/vixuwos.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gifuxodesaxoxigukedo.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/felaxafuwizezozujiji.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161356d70e295b---bakivupamawopoditoge.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b1bb20500b305df0390e555be900fb70/roluni.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/mewulamekesaxuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=control+firestick+without+remotePDF 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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 10748 bytes
SHA-256: a2c4c0b43882d7ffc8e4f35c2901cf74794447ad7fec7cca6c4aed86cc49acf9
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 18844 bytes
SHA-256: 41d6c85f29f6b4b1671f1631a6e4c8a8a02665bc52d2bd06175a68214ffb381a