Malicious PDF — malware analysis report

Static analysis result for SHA-256 8772ef89dc988c43…

MALICIOUS

PDF

86.7 KB Created: 2021-08-03 18:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c1450adfa5a61cfac4b575f82bbfef2 SHA-1: 554d446cd8373bad1d95037aad1abb6b67534329 SHA-256: 8772ef89dc988c43a0d99eedc35b1c5c176d3ea42780f1dd9f3cbecec12297ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hairtransplantmangalore.com/uploaded_files/userfiles/files/25085384088.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/668a427ddeda9bd1ccb3a8363c2a6f85/jemepupejuza.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4663dd1b5---xiximavosizutitujaji.pdf
    • https://flyags.com/editorResources/file///witozudasipepef.pdf
    • http://rld-carbon.ru/file/58404679484.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/zivawavijijupakovo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/40230d6db3c5182ac8d2aa2b72448cca/bodalevesiw.pdf
    • https://bitree.com/ckfinder/userfiles/files/kazuwabuxaposopuzakuji.pdf
    • https://wegofa.com/userfiles/file/duxodefabovusagasisajow.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ec65e1dbb8ee044b97f9095bbbeb26d4/pebugafe.pdf
    • http://szzxwx.com/Upload/Upload/file/20215281245559838.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9hbdh11r08aco9jcpbct3mb4s7/97950449188.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e3029d11592c0b77e19bfecd1bbbc12c/giseri.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18ea6aae2---kegotinugosipabofafuvel.pdf
    • http://currycornersugarland.com/admin/images/file/19538997556.pdf
    • http://kibbkw.com/uploads/file/92355106047.pdf
    • http://abwmercury.com/uploads/files/wejixe.pdf
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/dafolirupetigafuwu.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/90c3c0b3317732c0ef88ca8c1c86f77b/misonimudivobujogo.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7c898eea2eb5e1c27e3dbf364b631a56/23474669480.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/erptvmuv6chkjhvq5q8livsuk0/jejimo.pdf
    • https://alnahamgroup.com/userfiles/file/tevikikuxozosagilufojewu.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609da02328242---20402839129.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079b49f954e5---55232043879.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xenigepugelibumorepuku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=biblia+de+estudio+matthew+henry+ampliada+pdf+gratis
    • 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_off0000ea21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
font_01_sfnt_off00010238.bin
a246dc6a25ccf9ebb85360790f5e2c92237b129568de1842d5526d3f492081f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11440 bytes
font_02_sfnt_off00011cb1.bin
9282859e0ceef0dbdcc3cc4278bcc564f1844bdb218b007dd2247a3e4357167e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 18484 bytes