Malicious PDF — malware analysis report

Static analysis result for SHA-256 78546b82e8c9abf2…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 19:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07a28956e1106ec49acba0c808aebc11 SHA-1: 3e4889ab0a54fcc16cb3203138672c11fe3ffe1f SHA-256: 78546b82e8c9abf2f515a8348c8204071c2ad8d2db8db30249bb6bc067287b1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=what+kind+of+girl+boy+like+most
    • http://fullcolorspandoeken.nl/userfiles/file/vunipogefefiwomuru.pdf
    • http://botosani.ro/img/uploads/file/59208117918.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c41c37a58a4b371a2fb1b8c2aa34f62f/wejipamijez.pdf
    • http://martom24.pl/martom/userfiles/file/76275190331.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/f0b6e65cdfd3a3a6d6a1392e792e4178/67138100898.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ad51712aa6ac81d983c07db90b16e231/68699455349.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b097ebeb10---55183346642.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c8f4059---27012457603.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pb3ganv66hcr3qie6aqm7rs115/75308940020.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dda9cdb677291d2fa8803067c5d2b718/sofuxubexidawatizinu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828dee688e3---xaxisulipujipedot.pdf
    • http://all-vehicle.net/js/upload/files/jofujagewilenelawem.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc08b9de4---9497632934.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc52f5bef5---potigalanilopuxojugoxi.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae86088d36---11598030744.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/1f5f8218dd2bc7a96a323c57adf093be/dunojiwo.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071115345b59---57957399303.pdf
    • http://austria-ex.com/images/blog//file/68820390793.pdf
    • https://global-product.org/CKEdit/upload/files/vazefeletase.pdf
    • http://em-mould.com/ckfinder/userfiles/files/worukusufegugufirifixuxo.pdf
    • http://tradeweb.es/userfiles/file/21023688615.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_off0000f8cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 16792 bytes
font_01_sfnt_off000110de.bin
1fb8de58fbc0a4f2667ee7d7fa4c3281e5e819b54260b9cddae67a8db7cb9ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16968 bytes
font_02_sfnt_off00013ceb.bin
6975bbcca906287026c14cb08f8ff4f36a7327d1b6455a641d9e4b3f0b1fd96c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 11140 bytes