Malicious PDF — malware analysis report

Static analysis result for SHA-256 901ea9afdb9216f0…

MALICIOUS

PDF

70.5 KB Created: 2021-06-29 22:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 494af54bfdad8e57832fa48a19ffd60c SHA-1: 78003ff78ecde06b04e149daf8d1fea1400452fa SHA-256: 901ea9afdb9216f0d55b22a6ca0cd81c74548f3966a56b4d59b2fa009090601b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c38e18915---95112301896.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac88367a47---pekid.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e870657afe4b259424e9ae0c9ea4aa3a/mipidujot.pdf
    • http://boekenwinkelindex.nl/images/uploads/paner.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vscktnc716jaoo556svbrrehs2/jomago.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c4ae2ec030c7117354de48f63af861fc/39595889166.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fa683eff3ae271e2fb79bad28ba721c1/20594231767.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c61e697b7---vedogebasumilolazovu.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268af7d4e6---kajulomavozezofiwu.pdf
    • http://cuatro-pr.org/sites/default/files/file/vubof.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13733b971---72707299766.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53b3ksn7u3lr1k1mhmvjqig405/948159690.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/dl9j6j381f0d9holr6157g2grl/tatulisanatatu.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017f0c12f0---nebaw.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff7fe13ee---68696909645.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ae3af574a0f68223804c8c0cde3e0ed8/gomisob.pdf
    • http://bjsprt.com/uploadfile/file///2021062904443763.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/38103371032.pdf
    • http://best-infosystems.com/userfiles/file/dazekapowoso.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/70136343215.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1513b1591---kowutumefiguzefu.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b4uqhv5iaje6qjfrus3b64solf/xegenezezifodudix.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b867a3555---mafope.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5k3km2eficg3ulhjiip7dmclpp/zutave.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=grow+taller+4+idiots+exercises+pdf+download
    • 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_off0000b592.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB592 16792 bytes
font_01_sfnt_off0000cda4.bin
36f76c1a4acd40deae2da7a285d74958c551c37610d1e48e8b8b56f0887112b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 14768 bytes
font_02_sfnt_off0000f2fe.bin
d4c538e6a69a2080cfccb1cfc82f7a8a9a7c7230c048c6119c980b4f3d038601
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10916 bytes