Malicious PDF — malware analysis report

Static analysis result for SHA-256 c180944bba4b9880…

MALICIOUS

PDF

91.7 KB Created: 2021-07-02 16:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d967b152c219bd27367cc8a055a6fb1 SHA-1: 4568ab7d7543d7aeb1278f8f22514bac70c66095 SHA-256: c180944bba4b9880ea872c11f8b5b8648f0ae7bdf7dce6dfaa65b6a750a1d640
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress upload storage and other potentially untrusted domains. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d46f28cf---21310286084.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdf0dc80d---xawiputodexokakiwimuwem.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ac9c95f31245450f2e91bccd27e5c183/radibagufav.pdf
    • http://honyi.tw/ckfinder/userfiles/file/77460477703.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2c7692d5---39881044620.pdf
    • https://autotrans911.com/thread/admin/uploads/file/18680188467.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244d226389---5030024485.pdf
    • http://masonlegacy.org/clients/61515/File/72274429195.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64b1a0774---giwumowukunabuzureset.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/h2898gqo6ifqejfk6uki3qkrfq/kutabu.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2da664c0b6---47681356533.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb9db81d1---50743963082.pdf
    • http://0-50.ru/userfiles/file/54152526924.pdf
    • http://aarogyamedico.com/userfiles/file/79711818359.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c5278e5988e---vapuruguxut.pdf
    • http://thedewakohchang.com/image/upload/File/8973033610.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088df9904b9c---rifejaxevivi.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ed59e54afa6e1576dd3167d570b9354e/nedana.pdf
    • http://nw-line.ru/generic/uploaded/97500890387.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ede322af30137fd40c17e2e42b3a16f7/nivetozuz.pdf
    • http://holidayservicemarsala.it/userfiles/files/90227070509.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/240d61a3f7b520e629f4f765d3eac26e/dedado.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/759l8j24144rn2q6r12brk0mtk/69245739145.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/igtr3ms4jv180eaofaso3me94a/27502429065.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f45ec41c---wuluwufiwuxavumufuseba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=grand+theft+auto+v+download+ppsspp
    • 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_off0000f80b.bin
62f2a000c77502a2ba465b94c79fd4e2b2bb52b0d24ccb1cd103351a9aeb6d55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 10796 bytes
font_01_sfnt_off000110f3.bin
7b3cbab0fced769d0367e0861244124c9eec2af6442e0320b9710ec957465349
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 27524 bytes
font_02_sfnt_off00014949.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 16792 bytes