Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3c960587ec8917…

MALICIOUS

PDF

90.2 KB Created: 2021-07-21 14:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b135020f3a3442403c03f9853629dd3f SHA-1: a1ce10944595a88b2251f42a6c14d92cbd500f07 SHA-256: 7d3c960587ec8917148acab90e7664f868d2c55adab5975cf175c688bd1f0ef9
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or redirection attempt. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. The embedded URLs suggest the document is designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/o3kbnkg7nh2qimc039me5i8e42/vamopijozaxatabifofexifuz.pdf In PDF document text
    • https://alatheir.com/atheirwsfiles/file/52787518560.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29ee20157---94870811951.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/sidorofimonobuzigiro.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/46862530252.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0454565f5206c3a53432c6a62125a5a3/wupej.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27cd0f3531---10981243588.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca986d7b9---vanenarav.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/5482685726.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4ebe39a2---94302057123.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nujif.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/galenopajox.pdfIn PDF document text
    • http://artospace.com/pics/file/latogopazenulo.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/83976123383.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/65d2h2s7id1sot0c5bsios790f/tolosisejuterawiwuwebow.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/biwesoran.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/2f0cec2927497b8f8d3043665bb115aa/wixodebuxotamelurasudijuz.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/rulugez.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c2a29b14ae097b5bc6326ecf68d6868c/30862909930.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6834b7685f---43476127561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=justin+and+janetPDF 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://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_off0001002b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 10196 bytes
SHA-256: fe22ed0e9260dc06462bff69e884c1cc36a40c3a646ce38282a5a7944630e08f
font_02_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 17836 bytes
SHA-256: 2673c29865f8aa5bc52617a3306f3fcfb40f96809f1a95ffe85e392d6d4ec33c