Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a79ec69edea3d89…

MALICIOUS

PDF

90.2 KB Created: 2021-07-07 08:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddd659a4a006423d87caa8c71b7407c8 SHA-1: 10517eeb8d3ae0e73905e9103c243b9f00cf7065 SHA-256: 2a79ec69edea3d895db9821a01c22949c07978d8eba19e2c1948d544eef28d17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8fa420c4253692cc076135b0481750ef/32957995622.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bevulovipifuvilu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f2e17d0e---betisapedat.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/iurhuku2k46smd5s9e3ceg1ag9/xafubagitukititu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/b3g3n2te160eotqgdac3lv1gn4/dipuveki.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/990653767.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bac1a00322167dfa8f8fadf3be95cd12/rifusodo.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/lijikex.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f118c4933---lobatutumevorubur.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/54597623932.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/62357165679.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8bpe3t31q70qcaundc40576khl/32373825996.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72065061945.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/13298380675.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73576223b---filafikigavevitazijodemuw.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/42321513459.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/378074d758a5d11baabaeab08e9b1990/38950014901.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_085716_131.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/9087103299.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbd037631130f7ec533891c66e3785f9/zojorunuxe.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b6690f9b8db6883f765570d31fed5325/jewoxujesanez.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/8be3e5d15cb4b91b78f4dc8355cfcf6d/zuzowogexo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b269d44d539dda1953ceae5e2b9e70b9/wewenasodutejazubaje.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dc216c1632cbf37825f3c8e32e1bd011/34840514391.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/94064848468.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31f3e5656---rojunaroken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=barish+poetry+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 17536 bytes
SHA-256: 213987a0f66193b50195aa9e927335b67eb2de4064b512250de7c0b89a0e37e4
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 19092 bytes
SHA-256: 907bdea7e06a7cdaff0b469d6e050d162065a9e10261f1cb868371802c0549bb
font_03_sfnt_off00014251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 10700 bytes
SHA-256: b9f85f71a8ac712098e1c645d6750ab2b17b0c4bae4c8e68a43a29dda3a9dd5c

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