Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ea7d68f3aaccf9…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 22:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 747e61fad3a88848dcc8d72d1a16823a SHA-1: ee05fe9b90d5895fabbc843157f1e2bbb5687c16 SHA-256: 54ea7d68f3aaccf9b8be51a765e288bf1eacede0065eb8d7b8712d7d99e25836
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tamlaproject.com/userData/board/file/71431042101.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2a8532f8c713a7b4bd7aa523f2dd9a36/1813240082.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab42715ab5c---getewu.pdf
    • https://publicbridge.pl/userfiles/file/lifitegotepumalesobuk.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9c7a1a6aeae6d8a8209bcf64c3f5576/kosox.pdf
    • http://amon-syotengai.com/userfiles/file/gilanemuveri.pdf
    • http://burfel.ru/upfiles/files/90360258143.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/73531365040.pdf
    • https://termocasasrl.com/file/begikoxutetasavobigimud.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d3ed37b6a7d66c1de6021f90d08f1bc3/sibefepulafube.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ef01697afda33ecd62f3f94b5795bffb/70758454843.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a5a752cc4d8fee57a6a35736be7128b/86825985818.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e435b39538---bixoxokutupetesojexawoma.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e356e1b3e---39834291375.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a860060e---5377361035.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160969a08261a7---kakumowawobubozajotexaxi.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1cc4fd8f0f25e19bf4af5bd54b2d2942/nevibakiwozeduponawo.pdf
    • http://ehomeforeclosure.org/images/file/53186944711.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c353814a075---9671092391.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd759ed50e7---56494872349.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3vog78cfheuvi6b6oq657qhas2/45513283847.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37f9f0572---fapovalenedidafejo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=i+guess+that%27s+what+they+call+it+the+blues
    • 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_off0000eff1.bin
047e7d368fbf40ac3acf1c203bfbc80ae2c78d7f76005dbc616bed4490cdf9dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 10608 bytes
font_01_sfnt_off0001087b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
font_02_sfnt_off0001208d.bin
f67b283fc8a613a9ebd468a53ce39f87f34d8ce8c6fd94ef7efd28257bd79a62
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 17412 bytes