Malicious PDF — malware analysis report

Static analysis result for SHA-256 a948871a72e08102…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 05:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2fac49b3023319911caafb1376e47b9 SHA-1: e615793a05bd89bb6ba696c4fb7846753df11cf0 SHA-256: a948871a72e0810229a0198b89b407142455d5815189cc72e8b9301ca6c2d122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, indicating a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs suggests the primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://irlanc.ru/uplcv?utm_term=hack+tool+for+android+games+free+download PDF link annotation
    • http://tincorner.vn/uploads/files/77140710951.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/ratenolutogegijirifug.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7b1d7862cc7d102cc949fc0e322107e3/69528014816.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/lejezisivipefefojum.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/8149834358.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b74c68166bd9da8e479627a44291f17e/fukudulifigazojalubed.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210924211732305.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/62330677010.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/rojuwizetagix.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fad25b9f---30403004423.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161457369d597b---2395602377.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/71923448075.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/somisu.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/90762064765.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/xidowiparud.pdfIn PDF document text
    • https://andreivieru.com/ckfinder/userfiles/files/34983112506.pdfIn PDF document text
    • https://alutat.com/data/file/xisib.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/vekud.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97133374741.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/45428754925.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89754f42---56645898320.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/ranimexolo.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/zuxabupabepewikitoju.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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 15172 bytes
SHA-256: 74ace90455b59d558dea87ce57ffbec0520674c9089f4f3bdba7d9cabdcbd02c
font_01_sfnt_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 10988 bytes
SHA-256: 68956a3133c802a96ded6eba2db3e24c27cee64d8b0441b5d3892343f2729f72

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