Malicious PDF — malware analysis report

Static analysis result for SHA-256 900db6c906b44278…

MALICIOUS

PDF

83.2 KB Created: 2021-08-23 12:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5da975d22de4a612c24b7539b234c2b SHA-1: 415f664a4b4cb64d65ddf0e3c309f4221cf2b899 SHA-256: 900db6c906b442782fb1f99f6c03dd719287cd2aafd04769d27761969b2dee64
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 WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=squircle+icon+pack PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-7-23/20210723191418690553.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2a0c51b8773dfca35634f669bfb9e6c9/tolelezalasor.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/rolisonax.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa04c98d6d---kakabipomuveketidubozom.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nirasefifadisedifanitag.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/83955122709.pdfIn PDF document text
    • http://kammed.com/userfiles/file/wokawadojomiwilaz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087c84894e12---diribexagasefegeka.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/sagojexuvob.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/olh4n5bgqqjdtvia6fsq2bjhd4/39917888721.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dukovinibi.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/083eb72db2c4095073d4757466ca69f6/xugovuxuxotu.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/xuvubotiwogulawemibeted.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073467640c65---98162779604.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054d304a228---xibiwesu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///17873499108.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/30218999868.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/41546897718.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dogeriralilarixonobowej.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/4130343391.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a51f35b0d---34517818708.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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10512 bytes
SHA-256: f2002d71d185fe6abd4a851b7a88fdb91e02e4041c927abd321b675a6f22b818
font_02_sfnt_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 17512 bytes
SHA-256: 860cc007a77fb5ff4e951d11266399322c56e9dbb5d8b1fae467935cbc6ec48c

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