Malicious PDF — malware analysis report

Static analysis result for SHA-256 f503e44b65269723…

MALICIOUS

PDF

145.0 KB Created: 2021-07-23 07:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1197954212f47f2a1d16626a2817a2a SHA-1: 68cf1db5f2d67208d2fe6731169ade1c2b1b8048 SHA-256: f503e44b6526972388b5f716252168ce5d1f48bbddda5d3fbda000c4125daf53
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jnnycc.org/userfiles/file/xasowuk.pdf In PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/gozatapurozoduge.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba005f39681---7071286243.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dogagobizefad.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac722de3e14---86320057254.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/15512615266.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/milugojatevekukubunobuj.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wubusuzegabumugeto.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210706_A969E7B9FEFF8EED.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/48571711895.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b8ca0843---12005891269.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/e14cd07d1c2966cb1ff9811a9d37c365/pilakuworib.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16094066c70dee---91868710131.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/negakinuf.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/pafegevofosuwoz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974e10a2b2b---32362879122.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/dilaw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e049280ac8f52b4ee648b754ccc2be91/zajizibonab.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/vuzadajolujere.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0923441f4f642bba67f2308812bf1155/velexonuxabozamigenot.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514180028721663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=types+of+microstructurePDF 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_off0001d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D53B 10504 bytes
SHA-256: 08a81fc15981bb64a9b49d00c340861bdb14e8dc080001dda0f171eab0f35b07
font_01_sfnt_off0001ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED3A 19436 bytes
SHA-256: 923be87c844d343b20bdd7a346398a63451f7154d2d3fa1c7fc4c397ed0bf2bf
font_02_sfnt_off00021d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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