Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f64d954c0aa1541…

MALICIOUS

PDF

89.5 KB Created: 2021-07-16 04:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cba1b201702fee62d38615ed0a228ec3 SHA-1: 139f8a614ca7c4243c3f4b7a434825d18a58b963 SHA-256: 6f64d954c0aa1541fbb7cefd4417b3b162edf28fdc3c93c9eac415e820214c63
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, presenting numerous URLs that lead to external content, with several hosted on compromised WordPress sites. The presence of a 'Download' button heuristic further suggests a lure to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://susta.vn/userfiles/file/zopajokaditanedasa.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/vedamurozelifapugimetut.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3086cccf65---22743384544.pdf
    • http://jrmhandling.nl/upload/file/texivusojakunu.pdf
    • http://divapharma.com/uploaded/file/10652892523.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbe8f08977---47549271641.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2159f3de5---zeporapowosexolip.pdf
    • https://observatoire-omic.org/documents/file/65647506752.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4cick94jp5g5avuj4vmsbfdl23/64969305010.pdf
    • http://nfraccon.org/userfiles/file/5546428569.pdf
    • http://aarogyamedico.com/userfiles/file/10703354070.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3edcc79d7ef61b82d9de194e50987612/79212129961.pdf
    • http://askort.pl/Upload/file/66578376833.pdf
    • https://retta-bg.com/userfiles/94041305057.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dcd95b0d02645389cfa7973ca8180659/54524014141.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6b87db157bff47d167dec2ee19d06fe9/27685547072.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608060a85425a---fivobiv.pdf
    • http://palami.by/images/file/dodaximaxog.pdf
    • https://brs.jo/userfiles/files/teduvotejis.pdf
    • http://geose.ru/userfiles/file/12835377261.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e642172d0---33699996363.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf55b385b0---dafewala.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8323ed83e9---mewubusewizodanir.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b070e7152b---judivad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ece+viva+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa41.bin
b9fa5dc6d366d750638e27b2f194099adffb0b0b82910a3be521062e1269cf06
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 17252 bytes
font_01_sfnt_off0001273d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
font_02_sfnt_off00013f54.bin
8cf194595abb50a0829e8111aad55a308aa44146ebc4251083de8b976e81e851
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 10948 bytes