Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cd872602d99e0e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-09 07:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a367a241a25e83cab813a9ec979a6a12 SHA-1: 2cfdb7be48a4ee166018235bfddd6aa5f572e04e SHA-256: 70cd872602d99e0e3dc0a369ed33bacefd09cfcde5d5e867c1f4e689afbe662e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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 http://stellarp.com/userfiles/files/rotimopenesopawima.pdf In PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/73591118869.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139866b8a526---64143875667.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/jajamab.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/99548172250.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/xuvagedadesapiw.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210906060150.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/trsdme5krf2gkrqjd8u5s1v4m1/vepakiw.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/juxifodomi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161376df19b7f6---34024051664.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/kosab.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/mibulisu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/turoti.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161307674a1082---nevazumufop.pdfIn PDF document text
    • http://freeski.hu/freeski/file/pigeloruk.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac11759aa---judomug.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/xowokejitir.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/7191874024.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f8776da7---poluzubuxotibixumapama.pdfIn PDF document text
    • https://isleo.com/i_photos/file/11330609292.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/92218030050.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/61193503763.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a3269f51b---65454572137.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109032056143947.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/noboju.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/73554969608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gaming+esports+logo+mod+apkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 23040 bytes
SHA-256: 0c54630cb6663e29e2acbbd67b451f43a713df4fa66e093caf97da9d9980ff03
font_03_sfnt_off00013730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13730 10864 bytes
SHA-256: 5253add9967bb51f3faddc92cfaa98349857763d5e897beab97a2b99b17e001e

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