Malicious PDF — malware analysis report

Static analysis result for SHA-256 739a85e9faac2d4f…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 15:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d3a7b412176f4613f2b9f029db464528 SHA-1: f7412f67a4743bb42880339a87a1b7ad59cc3ddc SHA-256: 739a85e9faac2d4f6cdc284262e5e94d34cc466f5c1073bef19384e8797abc8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://underworldgear.com/admin/images/fckImg/file/doreriwupizi.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///71405698120.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371d8aceaeb---dakiguz.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/pufubuvutodosalavamatad.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e790a2b51815a819913fccae209d3f88/fefowizisiwodagoliwerutit.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/68980394216.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210907200516.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/zaxopitexagovunelisixinu.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/24304326344.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/u2sddl9e9op873c13bjfvkcnbe/powebogajamekog.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/7330207774.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/48984275658.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/1238885751.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/towaxosifi.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/dositewujimafabuwoke.pdfIn PDF document text
    • http://deauville.ru/files/file/11453961417.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19335053857.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/9797304431.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62245095679.pdfIn PDF document text
    • https://timminsrenovations.ca/file/x1eDITXrkkWlTxl2.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/76409448048.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/wejobuwej.pdfIn PDF document text
    • https://maymac.info/userfiles/file/jetunogobobulodakotibuno.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/vunolujabenebixotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jackbox+party+pack+4+apkPDF 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_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 19040 bytes
SHA-256: 0f8543c6173c5dbd92e90c958ef8e41107822c883e8ba221f62c244b1992f0e3
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10344 bytes
SHA-256: 6a3f052c6176efec41cb938f9af5d17f5e03a697a8869bc4d4d0fd4bdbcd7946
font_02_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1