Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39fe6e5f5f45a47…

MALICIOUS

PDF

106.0 KB Created: 2021-07-03 01:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a9a7658bca7a147b84208c59b098914 SHA-1: 25fc65c832b2cdaf4e60eae22c4406d2a5a01091 SHA-256: c39fe6e5f5f45a4753f064bc91034ef02d4ad0976c93cc0ba453232634ea8215
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The document body is heavily obfuscated, but the presence of a 'download button' lure and a 'remote support tool' lure suggests an attempt to trick the user into downloading a payload or granting remote access. Numerous unknown URLs were extracted, some pointing to compromised CMS uploads, indicating a potential distribution network for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://am-system.eu/ckfinder/userfiles/files/dumexatupekidaw.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d295523b---65770185900.pdf
    • https://flyfinz.com/userfiles/files/51176608378.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d297afd51bbdd84467c37a915bd6197c/26658473604.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5e926d9f---98704860722.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ab3ca89f---domopejazopivijubez.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a2f74765---sebepupenebif.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/tglunj6247uori35gj0qraor8r/59102463024.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i6gpnm97atccjkgnrd1qssipo2/suvuzodizegunowoxolo.pdf
    • https://cochleartudaskozpont.hu/files/11520622372.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/87003035977.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7f016063---73571792668.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2e5fdcfa376cb1e5ac7032f83332d7eb/moxamunonedexik.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080b2882977e---11260595312.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s1k9m75ee2gn88bmihe6sq25m7/94696754849.pdf
    • http://cuatudongnhatrang.com/uploads/files/xesirazelega.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392c3d35b3---piredorogudedak.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4b0c417b---14300065763.pdf
    • http://le-bouquet.be/userfiles/files/kovuvisupekofasap.pdf
    • http://woodbridgeabw.com/uploads/files/18190531889.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e97e7d9ae925ae8eaa1de0ae5ff7e026/gedarimu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vltjrjntnvk4gq2mnpa376tm1f/fujofewadavomujakefub.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8li9a0dj4b2bcv2rkf5pv0e5l1/kafugomom.pdf
    • http://akcjonariusz.com/UserFiles/file/tanisivojakezonuki.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/43920309315.pdf
    • http://stavebnevyrobky.sk/www/upload/files/87720832520.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+challenge+2003+full+movie
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/9e3e59c13cb09a3bee92dd67c73f4435/95936832684.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_off000139f7.bin
6b52be442a80ef29b51788c7bc814e4f562499fee1e044e1eb77f31557d4a81e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 17816 bytes
font_01_sfnt_off000168f4.bin
d80fcc891d40151a1c2062771fe6a2ac8573715f23c81982d0a614c0518ec8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168F4 10960 bytes
font_02_sfnt_off00018246.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18246 16792 bytes

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