Malicious PDF — malware analysis report

Static analysis result for SHA-256 004f15f514f6bde3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 09:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe8ccb96d75aaaf9eda570f09746331d SHA-1: f9fb2c34cd08cb5f93ce78ac13f3e8386f568c79 SHA-256: 004f15f514f6bde38fadc0f4489620c1f7a0d974d590817e7901e3f58ac25195
156 Risk Score

Malware Insights

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

The PDF contains a link farm structure, with numerous URLs pointing to potentially compromised or disposable hosting domains. Heuristics indicate these links are designed to mislead users, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://baikalspring.ru/ckfinder/userfiles/files/xorerewizazegewajuteja.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/i9g5tuqvjh3onrkqp6dguf7lqm/vefaxirinazilogawox.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210909180557.pdfIn PDF document text
    • http://markone-tools.com/upload/files/dawinopunanuvolesunij.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/97033994793.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/60438861663.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138c45942e6f---95913581609.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/juleza.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/ligopujar.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/74502826605.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/23457405824.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/90104133231.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210908212904.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/39499651498.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/sakuxesemawebu.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/52374329753.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_C4E28B0616411F36.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/75903276099.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161340d788694d---vekunizovupenavuzesoxotu.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/wizalimemofaki.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jiwosud.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/sedekasaxagajij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kd+tripathi+essentials+of+medical+pharmacology+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_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 18640 bytes
SHA-256: ad75a02a8b5d8460c4795ab17048c33b038c8741e1d7e4a6e4bd3ff2204f3ccd
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 11172 bytes
SHA-256: bdfa7b533a9e1752262f06dc138b66007ccfad5555b36991784065e1fd6f68ef
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1