Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c81827752659b33…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 09:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8dd4da5951c22a8feca069c549f8cf5c SHA-1: c9ab681195a4d6204d2ca4c7e6b7fc5976c2cf97 SHA-256: 4c81827752659b331dfca7e8cf72e86760ec414935e14f23ec23de0d5f0af916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://garglob.ru/uplcv?utm_term=application+android+en+francais PDF link annotation
    • https://sangolongphuong.vn/longphuong/news/files/dalevezelukobabefukajo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wojexuxolaxajowe.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/72449119751.pdfIn PDF document text
    • http://telecycling.info/files/file/mipedamiwibakizaji.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/deletijujiluwamujog.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/86448020742.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/domeku.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/41845702629.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/29506177883.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210913_1741A951660BC88C.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/72741852761.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146b33841578---99507666719.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c7f98ec916fe820b59383b8be766c4f/fegogagifi.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/kunobigaxazid.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f39fcf66c5815b82465726a1e97ed03c/lalesojujijimuvepabojumug.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/32411585709.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/29587469032.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17d10cace---pomexufivegovaxuwojoju.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/74261239135.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/58907085028.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/nifegonowezaxuweke.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/43789516263.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2ebb7fd6c36e010e57475ca5d3977929/71121050109.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipanifidibar.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vexinoxerutavaraxijixi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304e8a43f1f---rojusajixoretavitidul.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/89039050387.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_off0000c03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03D 18176 bytes
SHA-256: 4b98d7fc87c8f3cd8b9ca1485eaea628d2b031ad26abeb4cd7a0215f9358ab55
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10596 bytes
SHA-256: 284c6010d07df40c797af885a84ed4f1d0cee3b038fd7155df561375addb745c

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