Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b838ec546a0412…

MALICIOUS

PDF

88.8 KB Created: 2021-07-16 15:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cd1417d43c33ee1cfad5cb43646d827 SHA-1: a2fa8f228750fa1b7698822f93cc87d0ca645421 SHA-256: 20b838ec546a041268d2488588b225e68487597f513f9f3923f5c383f88f383f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate an attempt to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=wanna+do+the+two+step+and+cowboy+boogie
    • https://accesoriosalmayor.com/images/userfiles/file/rateperopadi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5341e7ae8ba1f351981cd2cdfed1e146/81072598779.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7ca83352ac01e299c1259fa357107598/70617554727.pdf
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/waluviwululo.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/deec3bc6e394228f83407c618a75cb18/88309289964.pdf
    • https://nikosdimos.gr/userfiles/file/linexatatulipuviju.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4c2f3e3dd2d4be5128168186a91f7d0c/vujunub.pdf
    • http://backkwang.com/userData/board/file/masetururudete.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e6b8b43a---21187298335.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac417386ab1---tusaxufonibarunas.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aff89546618df3bbbdc08d2aa67a2f9d/54533086215.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1t0njcc5fri586p5be8v66gvu4/muxiwolebebowowodok.pdf
    • http://lapawan15.com/shop/fck_file/file/gisutuwezifipuvedujovi.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sebamopedono.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/55fde3ad50d6792e07a5a9e8e94060ed/pifelejesinufuburaditubij.pdf
    • http://2ds-creations.fr/userfiles/file/6698478889.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071feaa3389b---lesilejudiz.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/vefikowunepujoji.pdf
    • http://delshadian.com/public/userfiles/file/zenik.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160974af23fd8d---xasudutema.pdf
    • http://happyhanool.com/ckupload/files/xonenevuzefoka.pdf
    • https://10glazsikeyrosa.ru/file/64484519118.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c676f1cf7b2---danabowuvebawuziwudumifi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f964.bin
644b5f8bded85e88f3b26c319849264e34850e676779a1577b051ad74c7dd29a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16812 bytes
font_01_sfnt_off000124b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 16792 bytes
font_02_sfnt_off00013cce.bin
3a8625f3a52761098b64965acd830714b7f2f00a415cd55e237b032f34c4d724
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 10980 bytes