Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99db2d8997c85b9…

MALICIOUS

PDF

88.2 KB Created: 2021-07-09 07:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ecbc0fea51a8016860e521e25c0dcf7 SHA-1: 92594a867f207ef48298a5f399fedac93e379adc SHA-256: a99db2d8997c85b9ec3e505f24f3ec91db0d3aaecc744ad794040d2091cd5700
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 CMS upload directories and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://beastyenergy.com/userfiles/file/40331363108.pdf
    • https://yingzhaoliuart.com/upload/file/takuwonikedoje.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c954f5a7efb---xafowufitisagutufufor.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/bd5597d4e7bb951875a314c5eb83e0f3/93890774999.pdf
    • https://angkorphotographyguide.com/userfiles/file/juwaxifodo.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c13aa8827b0---dimidurepajuxegawuj.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/samabomusen.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc006fbb2---lifanabewapekidatimil.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7380c76603---35137376901.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf035355b---6691717849.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/eeba53e9ececec22b1424132b6263724/kigenotatatafo.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/13626253310.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/koxukege.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608951044b473---43068258140.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3df34ba4eea6f825d7c9b1b5d5c01e98/37704686636.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7eaddca1650aed34740943a7fe8aa1e2/5377629427.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad3e06d8f---toxeguxonapininifex.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef6b72bde---walogipasamogujo.pdf
    • http://wib24-admin.de/uploads/file/55220078150.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/90e4fbfa5457ea8762babac2bf8a003d/49179347638.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/7nc8evsj5pfj9t29bmnq237nj1/xelifepazefuxinemutor.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/75272f0ea3076bc502e9df79be1c903b/14721422012.pdf
    • https://inverpalmas.com/aym_image/files/74103903216.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fd4759dfb1b51b239b43d2d1255e55cb/kilujofura.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/28379530352.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=field+report+example+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_off0000f6b8.bin
63316c97c9e8d110324d8242674057a0fb15cc80a3672b9370f88803c6d4dfb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 17148 bytes
font_01_sfnt_off000123a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 16792 bytes
font_02_sfnt_off00013bc0.bin
67272c64a178f38806b574bcce93fc6a4e521dcb51ee4cca92a4a6abac49a4f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC0 10464 bytes