Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cd26972a607cdd…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 14:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd79cc2fb2d17238e61d76c35da17216 SHA-1: dbb25bafdac9e25afb8559121eb26e86ebbcca58 SHA-256: 56cd26972a607cdd08d729929380bcda84d933fd6c34c4dd2717dd57b5437b6f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised CMS uploads or disposable domains. This behavior is indicative of a phishing or malware distribution scheme, where the document serves as a lure to redirect users to malicious sites. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://aurorabersinar2.com/contents/files/gunavalaxifavufuwidufag.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1736b71c2b20ed9dc298edb9744cef12/36463665635.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/84719063267.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/47577419776.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/lemowebufuzesix.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6t0abn32f9cs96ddcgtm3rkte2/22102437315.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s9ndb5q0ohohf905pd4vcul475/sewapugizisufokegu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9151f1070---xefobo.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/23740002659.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afa70f2408f---modoretez.pdfIn PDF document text
    • http://yuhongzg.com/d/files/20153802962.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf1bc55a58---kodel.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/42378797842.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j2e8k74vrcm6iapv1k8s1g956p/23351342835.pdfIn PDF document text
    • http://nova-auto.com/upload/98248370175.pdfIn PDF document text
    • http://efrex.cz/files/file/nixixupajeg.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nubixix.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ec197b4f---8995458262.pdfIn PDF document text
    • https://datawire.gr/files/files/vikusopavigogujetujoz.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/siseboje.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c5c2ef7338d139e459f3af2278799964/sukemuvolig.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab520ec54---vukasivisad.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/04/gizojuguguzugonizes.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62dfdb8acd---juxapifomeparododerije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fitter+theory+notes+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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 10476 bytes
SHA-256: d77377748e37fe0174e657689b644ca06a9c10e4ea9805d691e7f37c124c56b2
font_01_sfnt_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 17660 bytes
SHA-256: 23fd0152ff2c500f374864ba110de84b47038ae4f3ff56119c5359990f9ef01c
font_02_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1