Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b2a0ddb76b70f7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 00:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65e1fb797578e159f45bd041a62ac7ab SHA-1: 4ee23a37911d5730f33a7d19dc14563fa7b9d3c3 SHA-256: 79b2a0ddb76b70f76929aee63db4df5f4d4acb7f000ab8db14b4a5324dedcde3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dolaodong.com/userfiles/file/bajanevovibepirexovewebu.pdf
    • http://ntep2008.com/UserFiles/File/70756215713.pdf
    • http://champaigncursillo.com/userfiles/file/rixizevi.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0afc76a208e0c356ae28931c98cf722a/20438845519.pdf
    • http://jiuxingchaoshi.com/uploads/file/170507038632.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rewezasexuvimow.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9c2fb57ddebcb6642f95115df9a9fddb/tisogupowaseseli.pdf
    • http://kehlux.lu/userfiles/files/fuvugijurexegabularedazo.pdf
    • https://abss.pt/userfiles/file/39018689706.pdf
    • http://fratellibeninca.com/images/file/89586021080.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/59714557174.pdf
    • http://thy-environment.com/userfiles/files/21840940829.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b9pv1nr60g35ibf4jlirkar54p/lazibim.pdf
    • http://ingpoggi.eu/userfiles/files/matonimudibepanixubo.pdf
    • http://tuvanluatdanang.com/upload/ck/files/94951405563.pdf
    • http://cariboohose.com/userfiles/file/sunedij.pdf
    • https://vitanov.rs/files/xalulimowasuriji.pdf
    • https://tadimtursu.com/image/files/51909047589.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/xikar.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5688ebca4f231c973102ce154de42f93/gisufe.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/dabenubene.pdf
    • https://people11people.com/uploads/File/2503354094.pdf
    • https://pasifikendustriyel.com/userfiles/file/jiwitemokigejopofesodi.pdf
    • http://abwingsjanaf.com/uploads/files/55934854787.pdf
    • https://guineaservicesproviders.com/gsp/files/78118431323.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=a+dog%27s+promise+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_off0000df24.bin
264bf5b27b781fbc2d710edfaff42a96b30656d6b6e741d95e2f2e853d6cf84a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 16732 bytes
font_01_sfnt_off00010a95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 16792 bytes
font_02_sfnt_off000122ac.bin
20f99a5976f8554d68821ed1681d7063de49f1825972ce81917172a8ab961556
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 10448 bytes