Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1898ea2181ce1c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 16:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d49ffbc5167362c4b1642b7c3ca48bfa SHA-1: d7915f7a31ead61062026fc5454442997c32c883 SHA-256: 2d1898ea2181ce1c221d3dca569fd62b0cff72a45edf89458141f71ae2da3a79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. These links likely serve as lures to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=paul+rudd+jason+segel+movie PDF link annotation
    • http://jrpst.pl/userfiles/file/didilunajajodukuvikedasol.pdfIn PDF document text
    • https://kaparatt.com/images/File/15428593188.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/52748268670.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/detoxafapadufavuzov.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/rozizofepafi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e63e8faf976a7f5c5553c72ad75a25b7/7687003631.pdfIn PDF document text
    • http://kgmda.com/upload/files/18391482990.pdfIn PDF document text
    • http://findacommodity.com/upload/file/99608065106.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613343d742a2b---juxefunukodaximike.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909010557_p23ae5.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/948702f8826feafc1cdc7d7b5ac7947c/99136533617.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356766e10b5---puzadu.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/varatonotaliliru.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/vekapividefunepax.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/dekawufawepet.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc92082817---48951998483.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/bagetasav.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/40444264607.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/rubuvubameradadivizefuko.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/436040624.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/36868728163.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb4cd6b1a---bitirizopu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/disodopu.pdfIn PDF document text
    • https://termoformat.md/img/files/kalisikesadesukefiv.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/be10459d107be5f4ce0822e1a2434f2a/fufogedup.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_off0000b628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 10788 bytes
SHA-256: 188c3ab8ef8995b9a9b840958a9444818bc0161d71cadaf63b766bb67f0635a8
font_02_sfnt_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 16952 bytes
SHA-256: 7635767f91e000191986d11ce01022a4da7df295cde5a9fd9c25b7c6da57ab12

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