Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa561343ace070bc…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 23:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e88396ec3d6d402ad661ec20ce6893f9 SHA-1: ac2655d8520e2ee0eca0dafa6caeb3ec9e3e17c9 SHA-256: aa561343ace070bccf71c535a5386b15049a0c64d0afc5c765cd638be0ca6a40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, several of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to further obfuscate the malicious redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ingatlantv.tv/userfiles/files/tobarefosi.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6e503fdbc440d23d14a14a23be4232d7/1466874622.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/muzotako.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3da8b845b---foratidesosifikite.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/bosaxosuziferiduweturito.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/77115160140.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/97169692396.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac23dfcb6---70034290845.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/rofofolovaleluz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/53209274833.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094911da7461---36390409919.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a85e657b82---beboresifipumaxalawesizi.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/bevezafaxukes.pdfIn PDF document text
    • http://freeski.hu/freeski/file/72619842593.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/takoberonosuwulepekifuw.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/58249199243.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/25257435129.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fa6e9d08c628e98798da28b5d3138ec3/xepinujififepixivi.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/36662643982.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/bcb88e3de2c52fa0188b93dee87cd993/50838006961.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/rokelowire.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/a4a69c1c1541865560289f3a1049f1be/41602895140.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/4775038268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wallet+template+html+freePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bf50a09bf2f8857112321096086e9cb1/robuget.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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10132 bytes
SHA-256: b17706bfda534126b0b4062a18e9c4d95f28e0849ba061121ac3889cd632a250
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 18352 bytes
SHA-256: c6cfe9f6854d44a595afc2a68ba82e3f69430c825d45fe954c62ab2df6adc972

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