Malicious PDF — malware analysis report

Static analysis result for SHA-256 9037a89e9a48cb1c…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 10:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b52158131686b9c4fb69e0abfb137434 SHA-1: 20b61d39abc46fa43a95fade418c328af6610bcb SHA-256: 9037a89e9a48cb1c9c7202253ab7b5c6338680105ac930ab21d5ebb4aaf5bf18
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948f573d5d7---21224265405.pdf
    • https://sankohomestay.com/userfiles/files/zoteguvubebunoliwojil.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608827f42b755---xubesusikojituxuse.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/5a816a1c0097deecda97edb1c97a53fe/41762307285.pdf
    • http://altinellerinsaat.net/UserFiles/file/12868210092.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608cad479a5d3---4721547791.pdf
    • http://maychamsocda.vn/images/userfiles/file/6866899553.pdf
    • http://childconnect.com/swi/fckfiles//file/12125828467.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6aa555bf4319673eb2ce1ef5a038083f/vofufotugi.pdf
    • https://edusfera.pl/upload/file/nebatozobo.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745942ed1c6---pimepijofagexi.pdf
    • https://clove7.com/userfiles/file/porex.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8436d067c03f6083373dd272f7237620/11164366951.pdf
    • https://amrapalispot.com/userfiles/file/gaxute.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090a099a4e55---78553324275.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf334f1a00---rekewamixijozufadilefej.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7dd336ec315fc5ace0883cd46bd5221d/zosobisusitaxi.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae108362a3---95603512909.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b02f995d25f9a54f77c58e0c8b16ab8a/sinekekixufe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=schedule+3+drugs+examples
    • 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_off0000f892.bin
5cab023c8b09c7ad5629023934850d3a4858f2001707da83f7a10a18954ecc55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10996 bytes
font_01_sfnt_off000111f3.bin
e33d58b294ed387e03d20458e49e85f6ac03d6606bdc26d62fe5061f305d9b81
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 16360 bytes
font_02_sfnt_off00013c45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 16792 bytes