Malicious PDF — malware analysis report

Static analysis result for SHA-256 b896eca49ee1f3fa…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 14:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d8601b541b54364406a6cfcdaa9457 SHA-1: 12a51c2b0d5bcf15a2f9645f6cac87658265c1e4 SHA-256: b896eca49ee1f3fab440f226a10c24bb9a889aac12c8fac61401f0905d847b7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, disguised as a software download. The embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://kompaspt1.com/contents//files/14372605418.pdf In PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3j0oftiijacumas0v55fn71k1b/wurotufazu.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/jigona.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///62082746792.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/15965982314.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/favugeketanagatipet.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/norugarek.pdfIn PDF document text
    • https://architektor.ru/uploads/file/50351808451.pdfIn PDF document text
    • http://iltorg.ru/upload/file/kumanubusolilukav.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/bufefowizuti.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/43751542550.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/laloxidivurobomimozi.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/kanoropazet.pdfIn PDF document text
    • http://vhktn.at/images/content/files/79221469886.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/73292547484.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/52950069359.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/25f957c05ec8402b33e4c1b13070c200/nenan.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/metupatoduwitif.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zixonodanuxorezumobu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05cbadba2---3263879943.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/90014bb5d042583b51ca31d685f3e0c2/wobuxonujedurize.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9235a51d10940ca534ae77bcf72576c3/ladozupipigibekipumok.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/gonovuwafumudowoteni.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161315500d7ac5---47942757998.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/39036047432.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/paxuje.pdfIn PDF document text
    • http://packamate.com/userfiles/wimetenevowabafaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+software+konversi+pdf+ke+microsoft+wordPDF 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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 17920 bytes
SHA-256: 4d4486c42f94bdfdaa7b2c0cbb3682aaba8f93fd5236ec3b8a9fdff623b28a95
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 11028 bytes
SHA-256: d9d580fc0d9b6b26c8b14ea8a39f30549f224c400f245859e5e0011c612a52c7

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