Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26737af4cfc325a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 02:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7582f1cbd71e1e3d175a6b89d96351ea SHA-1: 03382e4c19d53a52605436b303dab2101cea9d71 SHA-256: c26737af4cfc325a56172caeeb92b29f65f47f4674963c8bd5f8184f5fb22c45
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking them. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68697101699.pdf In PDF document text
    • http://blccy.com/userfiles/files/woxazefira.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/89464689033.pdfIn PDF document text
    • http://annabarons.lv/files/files/bisepinelutofalivadomesom.pdfIn PDF document text
    • https://kueapem.com/contents/files/defejemegupojizej.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb9572d3e---ruwakosajomivigade.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fuxawov.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4841bd8c0---33680871334.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/bupotudabugiwumaji.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/xokowidagumukakijek.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vre83pobri4kin36lp4pos115t/kujejo.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/genemaboludanufademijizu.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zigedimekikolidakuvowefe.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210907162712.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/fetezigolurenegubipejun.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/63901967917.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/93236012679.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/vokilowumuwufofibukudop.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378f6468648---9490708727.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/sosowufulomap.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/fevitifepodidolojojad.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/50041519133.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210901175748.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c42f3dc8---30902258888.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/29205706536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=where+can+i+watch+labyrinthPDF 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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 18272 bytes
SHA-256: d55e56f3f5052ff5e4d51bec1f1a4cf549dd7e588ced4ff4fdad867d2b43bdab
font_01_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 10372 bytes
SHA-256: 0457d4261e4a28682ce964b16ea40d0c37b7f388ffeeb75d959c7584bce7d058