Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b6c923fd143395…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 03:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac2cfe66e5ab943dec336390a1b1fb45 SHA-1: ae84d5d116301c3f420dccdb54d2a19c3faceb58 SHA-256: 17b6c923fd14339502e8f006b045b3d431a81aec05c4c94bf585f060b66fbcf1
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of redirecting users to potentially malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as part of a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=nfc+apps+for+android PDF link annotation
    • http://tnhmc.com/userfiles/file/mofiwumoxofo.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/sodabowejunezizufuga.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/738076628.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140f81bd62e4---64309965838.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163053778741.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fbvooqr7vsb8ts3e5u4fr9ujsn/fuginutotapilakuduvi.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/96530626602.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/nasozakewowufi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090712414352.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109041509125315.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zovogirorigulun.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/9811380044.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/36296548412.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/30603001594.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/guvimiwaba.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/janopatibep.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2f7b8bee---ziponimajotuzovoga.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/73095192740.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab509e330---dunafewijemoneritaroje.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/91897798653.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614280b1c321c---nanelolitisodukef.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/962779241.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/sikipexozudefatujojovabe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2c040410---lorir.pdfIn PDF document text
    • 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 10312 bytes
SHA-256: 2f9fd1fba718e5ab702eabdcc190c01cd2c29ec4a9d702148fd7ea6acd56c025
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 18056 bytes
SHA-256: 2c37e41e576330e67f4081a6db35d981bbb138f32e179145fc430b7b4c33f75d

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