Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a6affbc14f1302…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 00:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d9a94fa9c4019146e9d49c220f62baa SHA-1: 1272e8841d47b21ce57d140a20d4d298c97faa46 SHA-256: 17a6affbc14f1302c192519bab763a0fd090497f2abb7bd39d1f73f25076dbf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to distribute or host malicious files. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://oishisushigd.com/uploads/files/jazivukigibofolipajos.pdf In PDF document text
    • https://kitchensofdiablo.com/upload/file/84038139243.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/rexuzale.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021926511549501.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/nozikimofawagafa.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/34123290198.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/tofekitujudavem.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/ribuvuvusapazugurozomeb.pdfIn PDF document text
    • http://sns.hu/_user/file/zobofusub.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482861018c8---89156960570.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/41867965923.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614e03335b7ea---13871339669.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wijexixes.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210919043522.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/xipebulasaf.pdfIn PDF document text
    • http://linza-market.ru/upload/files/61363962458.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8a3a600ae95ca2bf6d07ca351c57c681/47318255203.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/22910250507.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecad0446b0---30977895232.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/depovowuv.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/komisixifavutudadunevubuf.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/robafikusavud.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/11255840326.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/fixolituzuwubajoru.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/41660917436.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/ravisutaxuxudoduj.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/812628afa9964b3bc8cd37e266feaa8f/juwuzalotezadel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+red+chapter+downloadPDF 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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 15716 bytes
SHA-256: 365622e8ea871b1ce3db44ee8b53118829a353d84625d1f23f707aafd2e62844
font_01_sfnt_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 10696 bytes
SHA-256: b7fb1d5e93a180f899638219cf3171d0c62a5715dcc0996c04f980306b779a4d
font_02_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1