Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7df706b4c3e181…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 00:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3b26cb361dfca57cb2d34ee512cf7a4 SHA-1: 6c52d7b633c8cc23e6710a117e73b56dc56815d8 SHA-256: 5d7df706b4c3e1817e869b8ad9261b6b6921927cff5004dfa43f5a51fc586c3a
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. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/8ffjvo1qpjqjg0o2riu9kgtht1/dekisowefutokoboraj.pdf
    • http://asianmosaicnyc.com/userfiles/file/dirudo.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/zaratu.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4bce5f8c---rezaduku.pdf
    • http://dissanna.com/temp/fckeditor/file/pinunizabilijivukepuwip.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/ronugisajosozade.pdf
    • https://houstoncoinshow.org/FCKeditor/file/funimekuzomokasev.pdf
    • http://obasekiestates.com/UserFiles/file/54778252343.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/pn7p25ele9inqkg8ssa1gmjra8/57823521684.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bgmlgm80hlbcpv6kdkc63ar395/zafirume.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/af52d75b100a899965d0a3f4a8956a24/2387258015.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/5002525574.pdf
    • http://xiaohecollege.com/d/files/362479052.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/sjnseld87i26j2sek5mrdn2u90/83638025282.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835a8c08ce3---kafowune.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/70fc81c77ec2b5ffe56de0430e92ebf9/47609482484.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b10d6f456ee1cd71112205dfe48ffaf8/vowugiwud.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991ac5e16e---sumuvamisoxitanulo.pdf
    • http://primaneighbors.com/userimages/jinukatizopogosanamasati.pdf
    • http://whalesart.com/uploadfile/file///2021053101361236.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5b4c5af0efd2cbe6293803477557e898/51957039938.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/venoxadirawovabotenif.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/fde0ae49449edef82267607b91f4a935/90592117195.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0aa5c34b---28630392740.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=heirs+of+the+night+free+download
    • 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_off0000e576.bin
3f48e5f1f45ac43f2742be062bc89564bb86d6fd0366368ec148ce82475bf8e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 10708 bytes
font_01_sfnt_off0000fdcc.bin
c059b25274bf9932023c26cb2d640a48c14cd5aaac5d62597b215afa6ff84ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 19744 bytes
font_02_sfnt_off00012e45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E45 16792 bytes