Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9506461228d8c48…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 20:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 994f4bfe0e78e48b747cfe0687583e3f SHA-1: 436333dc3c9861b3fb2490db33048c8fb4200fe9 SHA-256: a9506461228d8c48c91ce97199fd2841f8bccd7bdc9c4a2304d59b12d715848b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11f57653c---63498400150.pdf In PDF document text
    • http://hagelkonzept.com/userfiles/file/73006236807.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/tipekuguv.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/55654567068.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/81951327020.pdfIn PDF document text
    • http://aplus.to/userfiles/file/25464413518.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e05432af4a---20846339983.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/dasopafojatifika.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tsq6sck00acgom52vv43s39abi/94827571874.pdfIn PDF document text
    • https://micsys.in/userfiles/file/gezupenobemejuf.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/kitujisa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80b0310d2---kevidusagizosisuguj.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cb46156b5ace7322d28fa2eb62cdd25/89855084381.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/9894277569.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fovunofalitalegiporub.pdfIn PDF document text
    • http://navigator-33.ru/media/file/rinifinizotowanoti.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1eb9a6e55e48fbb72f41f3a09cfc979e/17199438145.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/50264829123.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/16244867275.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j4l12sqrd8cck5ji99ap57ruvf/gefevesedoxeloweremo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/00253e603ade7caa631df3e5b0611a61/82214278821.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609833ed207d1---24047563621.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d6d55b28---64371894012.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/kejodemabibivudurufufelum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=phantompdf+crack+downloadPDF 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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 19844 bytes
SHA-256: e09f3d4b26188c11c32e65b0cf3ae236b97c747e3f773dbc0e43ada9adfa5ff3
font_02_sfnt_off00013440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 10672 bytes
SHA-256: 055312343152776569ea72d3b4a1ecf393d2b683c2c20755cb8cc2a4b171dc09