Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d1463374dc9a97…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 00:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4fab9163193cd882600ea49f0ef3d33 SHA-1: afed0a0d4db7cec6210d0d9121507d8e0aa854e1 SHA-256: 87d1463374dc9a976dcc219bc46cf8e3e9027ed17e38b7d514155bfc8b248bf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs suggest it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. The presence of external URI and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=rich+people%27s+problems+pdf+download PDF link annotation
    • http://hacoauto.vn/upload/files/52096128258.pdfIn PDF document text
    • https://ismart99.net/upload/files/mabilazopelixubigapu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/10009331598.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/77850477920.pdfIn PDF document text
    • http://demkapi.com/resimler/files/53241119998.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/77421487526.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b53af1f34---56008339037.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/76058082428.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/60570512508.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/nawaz.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/58676424521.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/90385642532.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/pekizawawezukuvi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebac2d4c67---falupajirogadodizew.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8bb6199672efb30754888a4b782a4f8a/kajuri.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9075aaf6---39343637282.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/2335190916.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/56k2icsgkltrgikjv6foo6l592/31071536387.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/84671812633.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/27872463977.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/57921460580.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusamepaparolemo.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/33209714489.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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 11092 bytes
SHA-256: 809f6a6c512970adc92bfc981eb9f304eb7e8906b0df8ae4ed0ff11ddd719d3d
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 18324 bytes
SHA-256: b161c32836c7ca297e2129080e8100220fcb0ca99322cd97891a431d032ad302
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1