Malicious PDF — malware analysis report

Static analysis result for SHA-256 05003d57831107ac…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 14:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b30acdb9c4b7ea9feba8e9429e7086bd SHA-1: 78ceabce5c231300d96021f1983e000e14334596 SHA-256: 05003d57831107ac61c914276ac88e0d710a96c665bd2c554a0caa9412b4ddf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. Several of these links point to compromised WordPress uploads, suggesting a tactic to host malicious content. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=offline+racing+game+for+android PDF link annotation
    • http://smartdeal.pl/files/upload/files/tidenuxame.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/99485105001.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fimikixibobopib.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161334c41a06c3---zetedolatopavijiwizano.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109020824386598.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/revolusogugejuvukefe.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/80273013764.pdfIn PDF document text
    • http://rurisnet.org/images/file/tekesolexijubi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614223366da30---xibopamijami.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kizepadugupidalu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/82379180460.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/69907646980.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/wulimolajow.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vupabupusodumu.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/girevozeketu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/tovojovoxixapelomeramun.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e1694e3ed85f40d337cec26d8646889/27770512440.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/zikitiniva.pdfIn PDF document text
    • https://kawanmto.com/contents/files/92394794481.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e81babb69---55895116425.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1a50c8797578571c058dc1d20a710f74/32213240943.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_off0000c37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37E 16684 bytes
SHA-256: ebba9831e606e54ca512c23a857ac3ea08fe6f9846ba001ecdf632ed98333d57
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 10576 bytes
SHA-256: a022347bbf62a400b2d5a403829ddd705a2ba529e5ca92ce53be6d0053925f78

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