Malicious PDF — malware analysis report

Static analysis result for SHA-256 8621899310f49ff8…

MALICIOUS

PDF

67.6 KB Created: 2021-09-27 00:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac8c87b8e451576ec6a5d8089be1e9df SHA-1: c7de2e205f4f562ac2198cf72b5316110ecb75a9 SHA-256: 8621899310f49ff89c8a675d71d2621bc807fa00f1ac6b8a4f1c45a12d1075c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various domains, some of which are identified as compromised CMS upload storage. The presence of numerous links on potentially compromised or disposable hosting suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tatvan.in/userfiles/file/simumosunipew.pdf In PDF document text
    • http://atrsara.ir/resource/files/67101949782.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/81144437769.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/64268408915.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/claep04a31e6vh9i4ukj44rpdh/gesekenuganinekopixok.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210909_EABD81BEC138E507.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/71210908013.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210908212726.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jilolomala.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/96762768895.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/57037467285.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/todozubaviposez.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-14/20210914061523445730.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16140e66b2de1e---dubizenolumo.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210912180427.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/96551929492.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r80b2um4dhfip534hc0889phoi/73786359355.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/83549015532.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/tibupowat.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/37801928370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nintendo+ds+roms+pokemon+sword+and+shieldPDF 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_off0000ab12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC329 10812 bytes
SHA-256: b856a9432d24f5a30bcc5dd12a1b224f5a6264e290a0f4719c5b1c0137afbe50
font_02_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 14908 bytes
SHA-256: 28a8201744d4b71aab39caa233ae496b32010e5dda50dd827bb407f90b6e58f1