Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76a5897acd43796…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6b5dc18313f2240f61dd72731ab7d23 SHA-1: d18ad7e940e34d57b7180c87fbb739109e83f982 SHA-256: f76a5897acd4379695d906b89d6ea742ecd4074cb54d11377c463df0ebeaebc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, forming a link farm likely intended to redirect users to phishing pages. The PDF structure and embedded content suggest it's part of a phishing campaign, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=night+shift+string+orchestra PDF link annotation
    • http://davcpundri.com/css/file/kikizurexemadoloneburapu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf7186f7a---dorejovu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tamuzojetegiwe.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/dhl8b5q6khsi0u2boqcf0ft4u9/bemegoxizumurekewulodo.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/viwelekigezusuge.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4600f4c82d035fad9bac1b9dd56d9fd8/82082219169.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/parivijoxelivisomavulul.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086aacd624c1---51206249609.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/77225934361.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e883ce0c69302c8660017ebac5202283/vowikemobasuvineforeno.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/pubitaxuferenakomike.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281939f4d2---pavego.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-4/20210804120420100596.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/24854021776.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/lujefaxogagizijatedivunus.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210808_124238.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d8090a817b8eed6de51b0797da14280a/jusikefeg.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/porodesadevetedijavag.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/16609753131.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/buwofopituxatapajufinu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b04d75099---13116731796.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ab29bfa93b240c6a285a03a839cb48ff/namasasifeg.pdfIn PDF document text
    • http://midel.me/userfiles/file/57133250526.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_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 17588 bytes
SHA-256: 6ec82c14db02563860df209c80de5a855c8c96c212de492bb1e0bd4b6f7fa605
font_02_sfnt_off00013a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A90 10544 bytes
SHA-256: 090e50ee52930324f3458e9a1d5d0687b69e20015ebdbdefb980e1f236f08cda

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