Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d0fc7345fa1a56…

MALICIOUS

PDF

83.9 KB Created: 2021-07-13 07:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f93a35b63c0509360ebaf5fa85c6cec SHA-1: 2865d0c33ee91f85a4bc690c585e8cc744d810f8 SHA-256: 79d0fc7345fa1a56165bb534ab70af6a0b65bae23f9fbfe7fabc4968cd710273
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial access.

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://clubesolbra.com/uploads/files/33520514213.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10c1a93f8---penoxokusositikizemar.pdf
    • http://domeinbeverdonk.be/assets/files/file/gugedimojuvisudupe.pdf
    • http://ampletrekking.com/userfiles/file/9403933665.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51ee2da4f---96900846261.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9ca5b266---15585283313.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bcb9afc03---14626649553.pdf
    • http://hitecds.com/userfiles/file/33226025914.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c569a0276ca---bugun.pdf
    • http://sitoad.com/bbqjoekey/files/202107090748563652.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/aa62533bea59cc6673a17004a85bd7b7/mufogobusozuxikorid.pdf
    • http://security-m.jp/tool/images/file/38714354877.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df19330a63---gajomapedejowawurax.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a30b00lkbo2oornqbii45lmr49/gupiniwofasuxusofeve.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207534ef64---pisefabujifawomiriw.pdf
    • http://creatinglifeoptions.com/userfiles/files/jivibugusoxu.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a02ac2ce4d1c66b3b67bfd5173f9879f/lasosoluxedeniku.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e1398de3---60639624320.pdf
    • http://allasclub.com/campannas/file/95198773753.pdf
    • http://siembra.me/uploads/files/lorurefuna.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/44d9c46851fab694def6ef58ef48d5b9/93538299481.pdf
    • http://tomaszfilipczak.pl/userfiles/file/biwopo.pdf
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/falutukademalatulawamaju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nutrition+month+theme+2015
    • 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_off0000e3e9.bin
39767a52336b9866d48da5a4b24cef58016b0572c23076e7b174f4a7bdf0ed88
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 17788 bytes
font_01_sfnt_off000112a5.bin
fe5d51819d8b8114515199b50ead17cb19d63a21cc6c8eaeccecd004ed57e5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 10504 bytes
font_02_sfnt_off00012a6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 16792 bytes