Malicious PDF — malware analysis report

Static analysis result for SHA-256 becc1dd83bad4ad3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 10:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 503c3da9a2f80e0e96eac131f38c22c3 SHA-1: 7af007194916a0e1af760e9b0854d1c536a17478 SHA-256: becc1dd83bad4ad3bb738b7f33f87ea08d6041be493d20935673c0a283eede65
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS uploads. This suggests a tactic to manipulate search engine results or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised sites supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://hankilfood.com/upfile/files/85420960771.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1i3b7pesditpkd6j0gsvsdea5h/fomafubemijazavozujozuwar.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/goporukawewototepupidixa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5b124b24---76921958363.pdfIn PDF document text
    • http://strandedtattoo.net/file/wariponojavubor.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eccbcf0750faeb2d5bebb831c3fe4764/92425257546.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3929f308---gatevev.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/920a99cb2f6bc0e9d84e5f92f0a71da5/75807988750.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rezimifegafa.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/fawogebidimekuxu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/eca25487e2f6cb38bfb7857e9aaac973/tomoxavarawu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/55q2nemu8b2de9ur9hqs24l2fv/90608216288.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/kudovoxiwesazuzuboxowazu.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/nemixuvopupire.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e58c5621---47243728562.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wowewugaf.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/10104272321.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/20717122029.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0t6pbtorf4beqenaq599k5p62u/jenesosug.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/moxupijofinotemitikenanos.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/vdvgt3gbgm6hi5675avcg6epeo/rigibelameduka.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecac2f17f0---memijetajoniwupuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=epidemiology+of+rift+valley+fever+pdfPDF 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_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 10732 bytes
SHA-256: 9aedcdd7148c0dd37855b0e7eca7adc61bdc0971832b5706ee76469415e72c48
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 17508 bytes
SHA-256: cb222ed41e998f258ecbdbb24f1066aaa216c441cd53377764ae66f96f6a75a7