Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a485510245d890d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-06 14:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7492d6047f7ea75f60342863817c73ae SHA-1: 39fc2aa1662d94c1861c1561b427434df22c56eb SHA-256: 4a485510245d890dbb9d63dbfb05bafc22e0ca1948d85876888e268aa07c99ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including links to compromised WordPress sites and algorithmically generated URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links likely serve to redirect users to phishing or malware-hosting sites, a common tactic for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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://drafthe.ru/uplcv?utm_term=intermediate+reading+passages+with+questions+pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7efa098ab---47228883309.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2369da70da---39688007823.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9780ef16ac---bebepibugemole.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/js9f073188i6tl0akhdtg43jb9/nelonamijejizexarawukap.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160919fe7817c2---waxebenuboziwob.pdf
    • http://www.yemany.com/yemfiles/files/tapeso.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/d954argmom6jmsb427q1h0lpe1/rekukobosaxaro.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/972224c904b158a23d74ec17c33454be/weruzimugimus.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b483318416662e281780fa45a3d39b15/badogasininifi.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/4533220732.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d9f3d0e74b16fec56b3a9479f2097fd/45822563701.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/384c62a857a7cc35f83b1472e22c6a8a/68649769237.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/87752929052.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/58292989697dac9b5e5e8afbdfd0119d/59809878790.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee00b4849---93874722544.pdf
    • http://berbun.com/user_img/file/fiwimaxozof.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d5bcf855ec6d152339accdae896f62ec/19866556339.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/71b2c448612d71f85c385acf0bdcafde/wolowux.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc4f659e96---53638017305.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/53109078312.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/966a2572995b7986e995044bbb6bb50f/jikeb.pdf
    • https://nhachoxebus.com/upload/fck/file/zewukifavijexivupibixebun.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070638bddde4---dozibofekas.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/fubelex.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_off0000e804.bin
a38294f5858f03926cb26369d9b3cadf95fe23260feced03bfdc5cf9cbf89f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 16692 bytes
font_01_sfnt_off00011371.bin
0f10cc32227e612a7c6b2951f66f8a067f6c5f92af682fb14fba3d946614dff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 11184 bytes
font_02_sfnt_off00012cf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 16792 bytes