Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0dcc393e3532be…

MALICIOUS

PDF

85.2 KB Created: 2021-07-22 22:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2222eaac3e179b48c180a67d57b6649 SHA-1: a8100f71b41dfc04d2e609b4bad8794d1003b8ff SHA-256: 8c0dcc393e3532be7aa46134ccd04c7f177b20dce3f5deb808e251697280569c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://audreyheselmans.com/_files/file/23242240966.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b6b4bbca276---gadepizipizolalekaj.pdf
    • http://rollfactorytogo.com/uploads/files/xoralulib.pdf
    • http://septumdent.com/img/userfiles/files/fifabejupavete.pdf
    • http://duda-tech.pl/dudatech/upload/file/47427527372.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fca57347---49031551199.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16088c682cde5d---nasanaxavepakorogi.pdf
    • http://innotack.com/userfiles/files/memegozedopebi.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/pqnaht3mmdnleeg28p6caslu57/17405018497.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3affc7ae4---45474621212.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/91649608774.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071af2b89b98---99381977983.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56330d6ac---34742931017.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082067d23085---51229353443.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/11321638267.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/magb2k6mc7bkqirr8nos2jtda4/pulob.pdf
    • http://villa-carlshorst.de/sites/default/files/file/lovimevizexitubevobuzuna.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2e53c8d39---rekamanixekurebefogatut.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607122c498f28---xikifinadilajuvepep.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q8nr0rrhb9tpfclh8bkqbmjbq6/13326644233.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f530e46e27---78240455543.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/xomagu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=principles+of+relative+age+dating
    • 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_off0000ebc5.bin
c7a35947357516cb780b96576ef0781522652638038f214ce59ccfc51eab6180
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16512 bytes
font_01_sfnt_off00011694.bin
a3a029d179ed8068083058685b0815ac293f3bab4d066ada2c9e6df76e3ee8e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 10864 bytes
font_02_sfnt_off00012f9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16792 bytes