Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a40c3a15ba6da4…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 13:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c467a92f929f9ba28d9d799aacf6d04 SHA-1: b2b4106156b3e220e416eb1fcafcb7c459d12b35 SHA-256: a9a40c3a15ba6da4879d3e1ff994deec90ab4dde965e6f3f449f0c1df007084b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The primary goal appears to be redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://asustainable.com/global/file/podibiwitugakelalobo.pdf
    • https://alshamiltrading.com/alshamilfiles/file/finabitan.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c89e99b7---kanojajo.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8771581ea3---78979482254.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb29607717---najokafemolipogesog.pdf
    • http://maychamsocda.vn/images/userfiles/file/zenatavikalexuwofo.pdf
    • http://keacg.com/upload/files/xixode.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/85920e92c12b9444b31bb34e4fa63768/45542572552.pdf
    • https://peterdegendt.be/file/naxatobuvepune.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b8520fb7---dapubepowedo.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13c6145c1---fivupepiwopaxajaku.pdf
    • http://domholidays.com/userfiles/file/fuxunumiverizug.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b079c98377d---fisone.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160716b6eea32b---83396387644.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abafcf1b2c5---ruzulelebino.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a3115137655---nibafukisuzivilete.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/dd9a7dd136d236dda3e63e23346fae1f/82968573306.pdf
    • http://vdadanang.vn/app/webroot/assets/files/95567810437.pdf
    • http://michalbaryza.pl/ckfinder/userfiles/files/kixalij.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c6fd554e8699c5d8211f915fc55f991d/77830442068.pdf
    • http://machinegroup.ru/img/outer/files/47036351610.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5b4e47ac---banemamunidezokajamo.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160869d6c21693---96005043728.pdf
    • http://www.majbrno.cz/uploads/files/pikogusomixazale.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kubler+ross+5+stages+of+grief+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_off0000f40e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 16792 bytes
font_01_sfnt_off00010c20.bin
262674a14d57c4647cb0190cec5724dfb96e9acc46160083a9fa9594b729b50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 17184 bytes
font_02_sfnt_off00013889.bin
d232bd6e4bc7ae9b29c0f3f5f4bf2db10875293d755d193e38a0981a34861af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 10936 bytes