Malicious PDF — malware analysis report

Static analysis result for SHA-256 436ac722e37e3a05…

MALICIOUS

PDF

78.6 KB Created: 2021-08-30 12:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d319daa42309761854b9bb33d62d9765 SHA-1: 5076bd1cb045e9713bbb660732a1bc2f0fdc7eb2 SHA-256: 436ac722e37e3a0532208cbaacbb3e6dc3607a310a8c594bae0330de541d315a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pistant.ru/uplcv?utm_term=names+related+to+stars PDF link annotation
    • http://ptaki.info/imgekoprojekty/files/kevejisazasuva.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/77414936692.pdfIn PDF document text
    • https://hgb.se/filer/file/98831609114.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0f02294b---2012152481.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acfcc10b75f---37961539538.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jazuxotamavariruw.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/20348861693.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/xoboladegugat.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bamofuxizolibovifu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607579319e2ec---5047719087.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/mifase.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/nogurujebasusitik.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf5bf407bc---27069326309.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b161e0373f855f63adb11e91368dc977/69432251373.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3dee88b29---jedetedobuludobetedabuf.pdfIn PDF document text
    • https://jambukuning.com/contents//files/96609576477.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fbac5ab00ccc9a40966c9d7694a21d09/busite.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8892b39d90---30687669262.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/589c315994ded45719ae094747efdc60/dizuvajuxe.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/fomopiluzo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69e23f100---44434301616.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/mugavedodorafopojilava.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 17708 bytes
SHA-256: 7f361b1f80324d63245bac2e4ce2533e1ffb9053c7b23c7ae2eac350922be55d
font_02_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 10192 bytes
SHA-256: f24b58431f08c38ca8660d6a9fe1a6068dda4dd0f6b334332119cd0680381022

Open this report in the interactive analyzer, or submit your own file for analysis.