Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfb1a66867eb638…

MALICIOUS

PDF

103.7 KB Created: 2021-09-01 00:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0faafe58cafedaf9b671dc90c126f2f8 SHA-1: 08164408556b485765f1cf54ca8d587f0d8cf14c SHA-256: 5dfb1a66867eb6385bc7f11a796779c1f89023677f4b8ef1d5253fff44c52182
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3b82463170dd55e61f179130d0a3d20c/85411536720.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070317a39bb5---49753548807.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/55642898369.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c880da4fba0---20403939164.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/giwuwasiliziwisujorito.pdfIn PDF document text
    • https://airbays.com/userfiles/file/melebifanuwevezevevuvubuf.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d446ac6a7e2---23061745744.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/376uct66grslr3ghbh3kdtr1k6/83056566013.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627811136.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c11975054015988dce7d64d21bc6d6cb/31289001139.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d32b062c.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aaec353f1ca---fuxuwejelamabitepemuxoj.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0f25018a---rozelasiwig.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/21932838914.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/fomefubedumajutisesag.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/megitagap.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d4c95d0b06c4fd81bd8b3cbc19dc4253/89392866688.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/49406430199.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/1e34f9c2a937e65218b38356a28deb8f/modepe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c119d11455d---26227203231.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/38965448642.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/watuwurupabilerawipawubar.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/12186899456.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/sitid.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zibadudasudigepupumasav.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/61211081270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=30+minute+full+body+workout+with+dumbbellsPDF 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_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 17772 bytes
SHA-256: e164ffa706013df2dc5f4a85944977bcaec132148bee73508466147d6884d5b8
font_01_sfnt_off00015d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D42 11184 bytes
SHA-256: ab163950adc6f0089dec6daaecebbd7d493d73aba7ecf379ff2e23c1b8afb862
font_02_sfnt_off00017743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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