Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6e6843e67c6bc9…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 02:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 790101b6a100f3f17ab15cecf36e4c3e SHA-1: 33d47910f5159f50fc3862f45a7ad9fb9ad181c0 SHA-256: ac6e6843e67c6bc9f8d1d49762b53a313a674c8a94a8c4777f8ce645560ea82d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to malicious external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ateliersmq.com/pevron/www/img/file/77853187057.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/27198bc626d5274efb59299c5a69d17d/77869111287.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/litupaxupomoxiwozokira.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109110556135553.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vaxen.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/25330363689.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/94819479935.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613be059e6879---83366416874.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/debezuvesonix.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/farifapozanujixupa.pdfIn PDF document text
    • https://digireg.gr/upload/foniremobukafa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132443ea7711---pubuwe.pdfIn PDF document text
    • http://acelybio.com/upload/files/viduborafojedogiwazafab.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372e5c13198---mebidabulazukebenire.pdfIn PDF document text
    • http://splogservice.ru/content/file/xubejesufiramuduziwat.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109110627244186.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/49201096211.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/56294900784.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/74867621659.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/21533426803.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/tonazenemitixaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spiderman+for+ppssppPDF 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_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10592 bytes
SHA-256: cfb425ed916bbe59f8018185cafdd18d16bff15741986ae6c6a96eedf4afc84d
font_02_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 17212 bytes
SHA-256: 0b9031ee6e2493277b01222e7e68d39200e6e6a13b3d302381f2a19dae4c8354