Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a84692d6322bd4…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 08:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d809c4e242ff96d50448407034286bbc SHA-1: 3f6bc77535508410945a73dc7d4b628e11daeea9 SHA-256: 58a84692d6322bd4c526faf68d3a490c0fee59386e557292dc8da413fd9e3d60
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution lure. The primary intent appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=sargam+app+starmaker
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411454c62c7---tisonaze.pdf
    • https://eownauto.com/uploadpic/files/65712964105.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca6713799---37144589702.pdf
    • http://synergyproperty.com/images/files/jadufeliketixovobewari.pdf
    • http://bodemveenweiden.nl/bodem-veenweiden-img/biwidurojuvovanojadawotis.pdf
    • http://vet-spb.com/userfiles/file/xunepagezemaxewi.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd892e60fa---85355361243.pdf
    • http://planetamama.ru/files/file/vudawonipel.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/20556003306.pdf
    • http://biancoacolori.it/userfiles/files/84207277668.pdf
    • http://jhdljz.com/userfiles/file/1630909373.pdf
    • https://stealthwindow.tw/uploads/files/202109131757034509.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mv91s2c9gvn2g9muakhke06ma4/nawiludizijedadutos.pdf
    • http://reopen911.info/media/file/xezunabojinitutabefonuped.pdf
    • https://kaisar168.com/contents/files/zuxoledukuti.pdf
    • http://ubestsports.com/imager/files/20210908052334.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceffb73191---16037778548.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/xupexuzovevawimopiludaso.pdf
    • http://nwhouse.ru/uploads/file/51456283299.pdf
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/10925343363.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0cec4d24---nokexokezomoletujexiji.pdf
    • http://www.likoda.com.tw/upload/ckimg/files/61326166022.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/40887752272.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/zeluwuv.pdf
    • 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_off0000b54b.bin
421a27a0a50b6ed2156c0c9b5b267b62806a16bb1b891f0ea51964280b1a18a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB54B 15360 bytes
font_01_sfnt_off0000dc24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
font_02_sfnt_off0000f43b.bin
33ea8c94bb729aaccd4e7d29d098524194dced68f449d92819b8e83251629b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 10400 bytes