Malicious PDF — malware analysis report

Static analysis result for SHA-256 a719841ed7303c7e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 11:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3734014f881024df3ca91a163eb2f7a SHA-1: a84a47f768a56d97703c927767414ef0becf03ae SHA-256: a719841ed7303c7e3f84423191d93390361d636741d0ccefdbdce7d2f26b11c9
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 a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=are+you+a+team+player+interview+answer PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/15d75bff9f38add8b1f25ee22cd0813a/91165676618.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f3fa529acce49f98c09199a023a0d144/tubebitiv.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/45071059558.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/96614093680.pdfIn PDF document text
    • http://ligneus.hu/upload/file/kirurifuvurigegoji.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/lijupotewid.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/77266949517.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/xavipegilasalowalopoxugez.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/32c8b9a41e4361059737a2e6e26ec016/zitexozidejapilul.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790bdbf2492---39862328734.pdfIn PDF document text
    • http://househouse.it/userfiles/files/65824138174.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gatagusuzatulotanotigof.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/dazebuladafemaw.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ng7968acqf8mk4qbqifujbuavm/tatafigew.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/p5r41otp65frnvsv3n53t17nj0/26305677228.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609002e5f0576---53910427192.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xolijexoxuxabilavo.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/50976929760.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/domaripesaragajuruf.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa36f3843---korudovaman.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51935997927.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9468a790---1149623592.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/27843887066.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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 17476 bytes
SHA-256: 9aa36da7e3ceae814b1b2565f3193ee460be3199a8070514dbffe135bded69fa
font_01_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 10760 bytes
SHA-256: 0f81ddb611fd499da2f49dc4a15cb86ab0a91ccc5eec1b47912bce662f4d0185

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