Malicious PDF — malware analysis report

Static analysis result for SHA-256 144343665db9b490…

MALICIOUS

PDF

106.8 KB Created: 2021-06-26 10:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55f3d6ac00d804ab9ac3736b7fe266fd SHA-1: bfe13b197e7e94f88ca6bc7251974b2aff1b5b47 SHA-256: 144343665db9b490f1eaa8c61901f7f7358577d1a10f340e1f14914932e26cb0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, with the ML model outputting a high probability of maliciousness. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4863abb82---ruwusobakepa.pdf In PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/bupenukiromopaximarug.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedb95859f---56475374696.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/11298808956.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608d783f89e82---16107220520.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1fca59d43---71295498010.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5d470403---binedixujokukedawokal.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/koeeabmc2tfkmmq8n0qpdq9kek/50549338871.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/15937036998.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kimiwitopufiwuxevex.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/94ukkkguoq31s8bg2o63p1ktnr/jifupogibudife.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/xutixanewipelirexizawak.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/32ead4ae41bcbdaa593a846391757626/4969750497.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qm1vqeu2lkicvuf8vat840q9ds/8862191906.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/mipufaz.pdfIn PDF document text
    • https://tempegaring.com/contents//files/zidixegowoponuxidalope.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/58884192700.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a641ad6a0cb---denedemib.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/98336394864.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a391709a---59941211363.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c1d169163ac6f22707458439de149841/bazafejudisedufawaf.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1c44cf8328c5f27aa28a4a589be08a7b/5940507428.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0b4e74f66e3125ad456ae8d3d78fda40/timavegelumixosotajo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/39d5cce75178ac7ac56cdfafa14d995f/sepadu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9c78khecsermeloof873u04ic1/9494356343.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zuxoviridinuroxajedorafiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=personal+rights+land+lawPDF link annotation
    • 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_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 16980 bytes
SHA-256: 0667c30947ff7d3d8e71a543cfeb7a7065a1dda781dbdbcd501b970367f08e88
font_01_sfnt_off00016db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB5 10616 bytes
SHA-256: 16cfa0b7795687a617c416d4ac759de168e883bc3f4b86e1c4bc1554a6d71926
font_02_sfnt_off000185c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1