Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c81162d134c299…

MALICIOUS

PDF

84.3 KB Created: 2021-07-15 19:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20ca0a7738341c03e46c4d1eab7989b2 SHA-1: fedaf4056527f45cd156f61170fffbfae3ad4c00 SHA-256: 00c81162d134c299b3f30c4040f4581276c6290bd6ce34d15efb9509584c935b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous URLs pointing to compromised websites, many of which are part of a link farm designed to trick users into downloading files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'formcraft' and 'super-forms' plugin paths indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nnkcreations.com/userfiles/file/vemizufoxigivupogax.pdf In PDF document text
    • http://klhl.com/userfiles/file/14960694750.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4892862770---34901360054.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d7f9280b3---nikiguwuremiwifuge.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95896f0860---60987555062.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a8ece27a4761f3e9fec5c75c19bb787f/84762296651.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/12777828007.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/34d2405d0957426b46c08ab37d304cf9/fivopoduv.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5b39ab75---kekupufijolaw.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7513c5420d5d22c2672ee1b9ba39feeb/falesasebipulawesegalo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/03/file/20210603_042518_161.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607718c77a4d7---2729469047.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5fgem0gphf3ggk2nv8uqkd0582/9686903923.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210616_3DDB760C857425D4.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a276ae8ab59---wowolulavesiguwoneti.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085d00d1f4f1---towupaxenetawofigeporovoz.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607727e422869---kelawubemukejes.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/nuboluwefofefuse.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d7b3841fc8fe292c81a4434250caa181/37463888210.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9033a1f5e0---jujasajifitevi.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/muvujomowavono.pdfIn PDF document text
    • http://sam-global.info/files/file/97596175267.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vorenekejax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=doc+to+pdf+converter+exePDF 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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10316 bytes
SHA-256: e209c223d9d2364e89dcd958b87833d2bac87587490ba64230c860913c84394f
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 17040 bytes
SHA-256: 57dd72fcb66aec34f7ece9ef1d1fb928c4d89908c61a7d6694c7f9a93d0e1a35
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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