Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd0b5081e0e8e8a…

MALICIOUS

PDF

82.2 KB Created: 2021-07-02 07:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd55b7c4b274252a1e06338a3f7b7993 SHA-1: 6dc5a46bb60ed010bbad7562b83bc12fbe043e3e SHA-256: 1fd0b5081e0e8e8a2b9ef680ebf1c73ec493a4666605cc245bcee7dac9834c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and the nature of the URLs suggest it is likely delivered via spearphishing, aiming to exploit users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf62607608---51103648448.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ff887aea---tesusamurubawoleb.pdf
    • http://curry-box-deluxe.de/userfiles/file/90821512140.pdf
    • http://nc-israel.ru/upload/files/61584475071.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/bc4ba7f9d25fa4f4a67082ffca32d197/saronakosula.pdf
    • https://lesfeesdelhetre.fr/upload/files/batalodovoko.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b320a79c26c---62676290620.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abda1fcda0a---gaxozesarafibaxazifik.pdf
    • http://targhevaticane.it/userfiles/files/fulukovoxidofawoxovavupi.pdf
    • http://raczcsalad.hu/files/wukirovebodet.pdf
    • https://acryl-bg.com/userfiles/file/lexoxurupobu.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e029b0a77---kapedowunox.pdf
    • http://insfilings.com/skyzone_classic/upload/files/92703322664.pdf
    • http://verduciautodemolizioni.it/userfiles/file/wupawapazinu.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07b9c908b---didawodilenu.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/63724971252.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/p5ojqio4mml1m1vrb1np7sc3a7/70316736266.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b4db1f9a---48999687220.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/ganafanezalikurak.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/tesidawebugume.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96f18049d---34277007883.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8c00afc1---56101236076.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/oeod0v5kgqr0oie35frgcpqm84/xifokexewigazutama.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a8df82f381dbf9f4cf55b6090daeabd3/42577099384.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093fab5c554e---33754421773.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=willy+wonka+candy+is+dandy
    • 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_off0000db8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16792 bytes
font_01_sfnt_off0000f3a1.bin
31521a45f38ddd957035050b58dd76b1f93980f966899c0e66214d1cd450f57f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 17812 bytes
font_02_sfnt_off000122a3.bin
c1b0904632ff40a11c587aad61d085bf0cfac794910c2e1bdd4f0125f04c07fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 10320 bytes