Malicious PDF — malware analysis report

Static analysis result for SHA-256 2902f7742828c805…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 05:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cd7f7e7b5042547e4bf5ed7c34d5504 SHA-1: 0fd13748dce242683e6d9ab65635d91e40eda12b SHA-256: 2902f7742828c805f61474f050c0630eacd199ccf92fb91c03cb13e8226c6deb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, though not fully detailed, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/64333978835.pdf In PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/7706451270.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/lazogifasotinamoz.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/794521570.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a1d9d5fa---74313697926.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608094cd9c091---gupojab.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/d1htv3cpnopble4j9dnvisj0s3/jatuz.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/dizegewizo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b5201bba---17533390106.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/76258093186.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/24080002728.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/dogivanelowaj.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ae466891bedc840f91d9a02a2ccefc6b/90669214376.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/90c3c0b3317732c0ef88ca8c1c86f77b/misonimudivobujogo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed3e774aa---88600910473.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160907e7488eed---37587325226.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6dfd785e---24433740917.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/vazofigebov.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb86ce3ac---kowezamo.pdfIn PDF document text
    • http://flexa.cz/docs/file/fiwujilepomufiwovupip.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/42129824286.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a567a410f0---nonasukufirokizusazivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=help+me+hand+me+downsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 19236 bytes
SHA-256: 4a7f4ed2c52102c9f3d5b6d7d919a779829a375513dd6b7e8d8218d7e50c5bd9
font_01_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 10444 bytes
SHA-256: 3033c9a822f08ce6f5cf9c96100038e2ebc60215aa8e860a100408e45198ae28
font_02_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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