Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4458d4558df49d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 15:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57e385d2bf72944cd14d01e3a440db6c SHA-1: ca671ad2c233e7dabe32d458511bf3bfa7dc0bd8 SHA-256: 2f4458d4558df49d7def712e7849cf94f37e6938634fde5705d2ebdceb97c31a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely to lure users into clicking malicious links. The document body is unreadable, but the presence of numerous links to potentially compromised CMS upload directories strongly suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7975e59d---68015335933.pdf In PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/78490243547.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/pulufimefiruwifepusawe.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22c833fe9---jafogopipobidav.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/rajubiziganemuz.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/resolivepanivosenodeba.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/61771956522.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071897c5f096---dirolesazizore.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/17244193939.pdfIn PDF document text
    • http://neteyes.eu/editor_up/21851812560.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/77370194830.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/legugovake.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372c4d55c---35673802306.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7ea353b80e6a5677fd0215acfbba15b3/bolutisovametalixe.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7ac6d84c72a5802fb2ac2583680f725f/zulamivujegovuregawofipiw.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pozovujawowesunefurevita.pdfIn PDF document text
    • https://menu2uplus.com/images/file/85565756088.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/55215524224.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1a8c9b72c---27287405147.pdfIn PDF document text
    • http://noidiengiaphat.com/upload/files/6221715796.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/fugipejifolagakezawe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857feae0fa---17133626328.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/58200794089.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d265aa2d8---71028884253.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/linomobigalitovuvupoz.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/51726742270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hiperplasia+prostatica+ges+pdfPDF 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_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 10684 bytes
SHA-256: 728c8c38daefa9c46c132071b090c0effca8bcbd7a117204f4cc93096e303a68
font_01_sfnt_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 17360 bytes
SHA-256: df8528a9716211b78768adf051ddc3e02b29f75fef7027273496e1b332251cf1