Malicious PDF — malware analysis report

Static analysis result for SHA-256 af38ad9adc7d99b1…

MALICIOUS

PDF

93.9 KB Created: 2021-09-21 05:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75fde70b33fb7625c91f96e83c447454 SHA-1: 10f56820259f44c2962ddcaab53bc56b0d2e2562 SHA-256: af38ad9adc7d99b128eb99cc753589c4e23f92a11e660be2d96299cbf0749610
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. ClamAV identified the file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=truth+vibrations+free+pdf
    • https://fototipia.hu/files/files/zibijuvugew.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dcf27248e12cf876cf2ea686f40b1e5c/39349087603.pdf
    • http://zhongyuemedia.com/filespath/files/20210920111133.pdf
    • http://conblocmanado.com/pics/file/jodigisesedejoninemoguwe.pdf
    • http://pronobile.de/catalog/file/godirofetonarojirubirix.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9179b526d---xasasidotebosuxi.pdf
    • http://wwsm-us.com/files/file/14306546098.pdf
    • http://namthangbasaltstone.com/uploads/image/files/64197531711.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/foferopi.pdf
    • https://ksdc.in/userfiles/file/forelozudet.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/24384037731.pdf
    • http://mkpstroitel.ru/upload/files/jimubedewiba.pdf
    • https://glearningsolutions.com/userfiles/files/lurepefaxoginijugolumorem.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/buvilarukotusiwisurarezi.pdf
    • https://pointvirgule.ca/upload/editor/file/tututarenax.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56487d72a---rinatipekavewoviguvaf.pdf
    • http://ideal-site.ru/userfiles/file/biboto.pdf
    • http://geraldinekilkelly.ie/pofixilubifu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/u8iuks1u46eq902pj8o19e5u33/96385383998.pdf
    • http://brenno-tojestto.pl/userfiles/file/78219437071.pdf
    • https://concurs-euclid.ro/upload/fck/jafakojarinazuk.pdf
    • http://forspeed.cz/ckfinder/userfiles/files/vagepi.pdf
    • http://rigassprotes.lv/uploadz/file/95074849348.pdf
    • http://mtkshop.com/images/uploads/file/95180074411.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/93309479015.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_off00010716.bin
fdd1334c42e6a2e8285b30bf35d8c8c700063143230057b46ff3dcf6f100baba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10820 bytes
font_01_sfnt_off00011fcd.bin
073d5a188ada969fc699bb970966bfaa934e1e8d16b4a47d4c6905d6b259b3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 19260 bytes
font_02_sfnt_off00015151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15151 16792 bytes