Malicious PDF — malware analysis report

Static analysis result for SHA-256 d439579ee95e61ea…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 12:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2b27ede8fed4ef5f7700731fcf8e7de SHA-1: 1c811ae89173810461abb7b71be97f170d93215c SHA-256: d439579ee95e61ead9e7a8ac87519f4985a52f9c0723c5196d15d159c4eeab5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The file's structure and the nature of the URLs indicate it's likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kq1nr5np58jfrok6fas3e8bbq0/tokifitelugavijidafimu.pdf
    • http://giaexploring.it/userfiles/files/52785960301.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4b1b6a5bbf02def4990b5839ef23b853/68171696480.pdf
    • http://www.pvvc.cz/files/mogakem.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/06/11439674481.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meforuxonubetojosoperi.pdf
    • https://kitapkapla.com/upload/ckfinder/files/zekijerowav.pdf
    • https://omprintandpack.com/userfiles/file/zukebomunifudekafedule.pdf
    • https://hongmao.tw/uploads/files/202109111549151240.pdf
    • http://biondiairsystem.it/userfiles/files/vagikevuneronajigisaja.pdf
    • http://exmar.it/foto_fck/file/8061426889.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/m8ahifbrubba6emhv9orvq918j/56391483430.pdf
    • http://ternovykh.ru/content/file/gipuvepotodezulomasefiwuf.pdf
    • https://ldcpc.com/ckfinder/userfiles/files/kadudiwuvogusegisu.pdf
    • http://ackerviewguesthouse.com/userfiles/file/94101587086.pdf
    • http://kammerchor-lindau.com/file/59965240895.pdf
    • http://fotostudiovaccari.it/userfiles/files/18315621722.pdf
    • http://skiflogistics.ru/userfiles/file/wojorimaza.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9252d16edf1a609eb7ecbef4b1bfc325/50530471724.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/63009421718.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/4623042451.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/pelilesedijefagi.pdf
    • http://primethailand.com/ckfinder/userfiles/files/netoziloma.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/misunugemadufobezal.pdf
    • https://johanbjerke.se/userfiles/file/xudomibisisikutipifiwem.pdf
    • http://misr-consult.com/userfiles/file/285746555.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+set+up+hotspot+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e5.bin
bc6cfcab3934742eaada354d0c8962f01db4a26c3b487d0b2cfd984361cead77
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 10620 bytes
font_01_sfnt_off0000dc24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
font_02_sfnt_off0000f436.bin
685c883d5e4c06ecd7ec17d6a1b85404a23d1c78ab801b5bae2011c81284f9e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16796 bytes