Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5888a6b93fef78c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 03:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16f38df14442fdb15896517d749257a5 SHA-1: fd1cc222c171bf04ca746f5512d59d590d4a1771 SHA-256: f5888a6b93fef78cf87d4f0fab8ba6920c3713bb39ea52d294db0ce3684ecc24
156 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, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which is a common tactic for distributing malware or conducting phishing attacks. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://siltherm.com/ckfinder/userfiles/files/6146519579.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072a58f74058---6891391868.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/kozeresejokijizu.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/tuluvesebileduvorisoxaw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fufanagifijuwuvuniku.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/24828670187.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/007628d26a84ee312ce0e87e06117597/daginorapabew.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/13186915867.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/xanegozefatid.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/68006206753.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882b7fdfbe4---55866248802.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/71541186523.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/96222773866.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fd2j4h0hokvjvateav7qv65nc2/valusekegapusizekofegi.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qk9f07qfmev16d6c1s8nc5mnlh/norodofesumabunolo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131db9a500b6---65924107601.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jnva89e61uuhumdtu1fvv6sad1/22533014585.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/95496240649.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/35811214239.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/gukefadejabave.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pekubabinidumebebudaranon.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/42c79ecbdc8a91e8b233088f3ae8d167/vovonaxodaz.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/jatowojexefexowor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=quran+karim+download+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 10600 bytes
SHA-256: 8020a978218d85b456a098865c0f68d2414ff05e4b31590e1c9f40cfec74d9c5
font_01_sfnt_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 21332 bytes
SHA-256: 15e4f6707382680cecf57f990ad795a2945a179a2fdf3b12ff14ddabd23f5742
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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