Malicious PDF — malware analysis report

Static analysis result for SHA-256 db58206ba0f13e5d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 23:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f9b0ed9608e6f844c94e19c6e0ed3d3 SHA-1: 35113d1cbef291b2a5a2ee8ffbca0685ef4d766b SHA-256: db58206ba0f13e5d9f0c93482ffd5496c9fee60e8599c8a3c7644b5bf7bd8be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong likelihood of directing users to malicious or compromised websites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=samsung+galaxy+s3+vs+iphone+5 PDF link annotation
    • http://fabriziocar.it/userfiles/files/seloluzavafidanipebutu.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/52671513477.pdfIn PDF document text
    • http://tzsunup.com/upload/49820066769.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vogolo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/81697517690.pdfIn PDF document text
    • http://jarosi.hu/files/file/3158725205.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/kovomovirunona.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/laxipubanumebofewok.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/28865030845.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ecc759244bc56773b8882adbcf221cb1/degubesomofateziruxiwutag.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/ruforatakovi.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/85118378259.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/22120939423.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/xulizifarimujinuv.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0bf60d549---duzenajamumijizodag.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/notodulamogoketiwujeza.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/8865363310.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/dobarinebefokidekez.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d847c26f---jipizi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/55409cb1fe55cbdadbd97c13397d6b6f/luripewop.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/63004051093.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lakutizonipibozudapo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c711d1bd---23806516262.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/zudawel.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/gezuwodibogigaxapi.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_off0000b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB668 15896 bytes
SHA-256: a04b754f14ee8729daa7a8cc9f8c71eba0180fe094bdb1abbb0f5ab627e4d10b
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 11264 bytes
SHA-256: a57f3be3b4fdc184e29ab40ced86e8756c825793a42c2c362fcbedd3784b2b33
font_02_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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