Malicious PDF — malware analysis report

Static analysis result for SHA-256 493ad4f02e9c898e…

MALICIOUS

PDF

93.5 KB Created: 2021-08-02 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a61240d4d19a7b909eb87f08683eaf1e SHA-1: 8aceffbfd7357f87682cce4b79d956b8fa93bbbe SHA-256: 493ad4f02e9c898ee5fd15a6ede428d7a129b41add96d9af6b6ddd14590d2553
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf8062730---pomix.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076daff70511---98463535333.pdf
    • http://geopraxis.it/userfiles/files/9859032377.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3e26d4e4---defemewikejalimajufowasid.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/32497495194.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c97c7ed3ef2b626c54b4575ed86aa490/jajuzitilabexa.pdf
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/53647209561.pdf
    • https://dnmpaint.com/sdcc/images/file/wavefere.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0bff1c0f---dojekelodusabajor.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075539f3f5cb---xezerira.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5cbda53472---viwivusasepapevafumoj.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4d78a425d550a306fc29c78799f4fe99/nigazati.pdf
    • http://greece-ex.com/6555708265.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8924ff2d---kulejakuwosij.pdf
    • http://aeronautike.com/userfiles/file/reribawejamaludusekemo.pdf
    • http://hopkins1983.com/clients/861771/File/kiwuraniwutezofasawar.pdf
    • http://spreewaldatelier.de/img/editor/file/rupunelikuzibuvomaw.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/fetajujuv.pdf
    • http://harasim.cz/uploaded/files/5106833795.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e61a064b7---26321754161.pdf
    • http://angarakshaksecurity.com/userfiles/file/zeruzekiremodu.pdf
    • https://arichaindia.com/userfiles/file/guwefowokofumopovekiva.pdf
    • http://sl-light.ru/design/img/upload/file/75612148458.pdf
    • http://chiangmai-esc.net/user_img/files/89968175629.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607e484f3664a---rugomolisofezatavur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sniper+3d+gun+shooter+mod+apk+download+android+1
    • 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_off000105a5.bin
68dd84c068dc0f539cd24bd4c1b2b202bb67a3a93f4dd2b9ec1def153e01a9f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 11416 bytes
font_01_sfnt_off00012047.bin
d2fe7151b02b320d78e6b602ffc5d73eb5cddfe424256cc1ba24fcc2833100e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 17856 bytes
font_02_sfnt_off00014f84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F84 16792 bytes