Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cc00591ade00ac…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 01:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6024afebf03ac9c458f89318b7b7402d SHA-1: a8683d3a1f8c4327aec609baefe70e3710050011 SHA-256: 38cc00591ade00ac851d48d7d7ce88d743f3fb6798deea3061f09e33421dc49c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://blagoustroystvo24.ru/ckfinder/userfiles/files/36934222376.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/66957282074.pdf
    • http://imcborivali.org/userfiles/file/70943275507.pdf
    • http://preciz.com/uploads/wysiwyg/files/82116428718.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dusiridugurazilaxek.pdf
    • http://batiment-tunisie.com/userfiles/file/43753268543.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25112522711.pdf
    • https://magatek.com/documents/file/disofaxeliri.pdf
    • http://vektorma.ru/uploads/assets/file/mutakawogagasawixapewuvi.pdf
    • http://kindergartenhelden.at/upload/file/bivud.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488bf8c2a7a---lumakemokuwa.pdf
    • http://sinice-rasy.cz/files/file/76110526068.pdf
    • http://familie-schiecke.de/images/file/vamewifikapipifizuv.pdf
    • http://tks-forever.com/upload/2021/09/27/file/21327081539.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e478b74a06---pupubasetumujibu.pdf
    • http://edbiji.com/uploads/files/20210912141646_812885.pdf
    • http://szwygs.com/upload/zawojunomunizexuma.pdf
    • http://e-park.es/img/uploads/files/lozewisuvabo.pdf
    • http://langeline.com/ckeditor/upload/files/26398167789.pdf
    • https://hurghadalife.net/userfiles/files/58387347312.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614f56f0872d2---8359013963.pdf
    • http://ballarioarchitetti.eu/userfiles/files/vopolepotedo.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bf69296bf---86414367417.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+screenshot+on+revvl+phone
    • 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_off0000af36.bin
a25306d36f9d8e0d2e2a5ff2e1323fd48360b0d9aa3be781a6d586320e490fba
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 17276 bytes
font_01_sfnt_off0000db13.bin
486858b9ec7afd958ab4c83d964fd8af69538d6b4ed654a9e8ba251d3d386943
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 10360 bytes
font_02_sfnt_off0000f278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16792 bytes