Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7e6143abbdcebe…

MALICIOUS

PDF

79.7 KB Created: 2021-08-22 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05c869ef63e0bed0af097b419ff6e1bc SHA-1: 062c6fc2381659ac0ba81dbe2378d3011694e61c SHA-256: 3a7e6143abbdcebe8046b396f7d9b9b2a409bbe8aecd0560b9acce67e0e15ceb
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users through a series of links, potentially to a final malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611915f003de3---nasesaboginezanesizuzi.pdf In PDF document text
    • http://alisawedding.com/upload/users/files/vironefiregegorizatazupin.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-15/20210815180711950486.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/jezibapoxeko.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a0972d0c5---sevokiligimab.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/53264525628.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc5b30b763---patipelojeturawazes.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/48736963783.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab687f3a153---nulaxoniwoze.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/59078527935.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2aa7f8dc0f7096cfc48f20d8b3bffc78/38550882910.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1b1c2d2a4f06345d66414c61edaca6f6/7223112103.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/660uvtfv4nlrnteqkvrdhtut61/64918583367.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/nezewevupunemiziburoluni.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/22297122297.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/86998727708.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/sanapemavolonaxivot.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/tosopuviwonatodategesu.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/34114390635.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b045ebb3ad---26336092472.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/02803a382654956a40d0f3e32c3060b2/gudizerovarujekadufepakub.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/78341105718.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/89653345374.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/88793ac72b78c6f1c89a4d93d61dd7b6/topelujujewidedorobipa.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/28875924164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+the+6+steps+of+research+processPDF 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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 17216 bytes
SHA-256: 698def36cd6386ecea0d4d6df299102499d812b07c8ef2eec1c68555c156dff3
font_01_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 10496 bytes
SHA-256: 48ac982b53f0d1b2a8a93728eee0f243e3fe9cab23e91417885fafc9ff79f56b

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