Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bff0224c6590a76…

MALICIOUS

PDF

73.1 KB Created: 2021-06-26 07:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c3638c5af98ee9c5e0f0e2da461c5ca SHA-1: 797d6f044947e65ca9f48b82935e9e1dcb08328d SHA-256: 0bff0224c6590a76a2af823d57f54b78e67c6001dc9706304386bcb68813f085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7fe6edf7f20aceb60911b4291bb28bb2/pinukimokelewetigutekoko.pdf
    • http://www.vegagastro.pl/upload/file/38664345795.pdf
    • http://kovacsoltvaskerites.hu/images/file/zugizunoxitibukut.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4b6a3988---14425188496.pdf
    • http://asiadomainstore.com/userfiles/file/saleku.pdf
    • https://lienlacanien.com/img_pages/file/12743072904.pdf
    • http://charivne.info/images/file/74350444745.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/kk38j3vj29p5cttha2ctubh0a4/87914355279.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/18222531950.pdf
    • https://abofahed.com/userfiles/file/xepuwemomagoxixivotumo.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/265d680867bd6a158636af1531f34e17/gigozakamopedopejutom.pdf
    • http://abpaluso.com/upload/file/88806777347.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e23918b6871c04fb309989a6039f8d6c/68519441551.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6aea7bf65283b0d56e2230ac03bffb3b/91339485184.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/e86bsset11ksofgat6pa5cl2r2/nasomegejasozuluwe.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7e8b3d13ab07c183a0073f6985d41290/venezozurube.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/38911515467.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e7621222---18431336339.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c166123e6e1---kubuzakizesuz.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba57a2a8a4---56419933248.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=quantum+qhm300+wifi+dongle+receiver+driver+download
    • 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_off0000b959.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 16792 bytes
font_01_sfnt_off0000d16b.bin
1d8c133d49f53275897b276f245ae3b589ab959b67c9b8e24242b47837030b3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 16520 bytes
font_02_sfnt_off0000fc82.bin
4a031133fca6e02fef7b4ecd48242c038463f35ef08b91b24f243f53931405be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 11504 bytes