Malicious PDF — malware analysis report

Static analysis result for SHA-256 8021a44c8503dd39…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 06:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84e0d8a77789312a792b7420cc588f8c SHA-1: 33f8026b61811ba3b2387b4033a0c10aeeab92b8 SHA-256: 8021a44c8503dd39856ea499efe427515ea42f2e9ac943e37a44dc95f9bb3e41
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of multiple external URIs and a 'download button' heuristic further supports a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • 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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4152ae52b---93565616856.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domelipimi.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2799e6ab51e0364d1b30b7c81a154ae4/96362203194.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/timinisabifodiju.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5b917a24---41784808789.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/ginaguwaxizobox.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/f2i31flgqj6vm1cr5uo2aimid3/25553372180.pdf
    • http://swaminarayangm.org/userfiles/file/47976636550.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607902f42aca8---ledixexamirig.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/396d67e5b79a751877ecb10c8f4afd5c/zogedimonusamote.pdf
    • https://alrukn.co/userfiles/files/43319395078.pdf
    • http://beastyenergy.com/userfiles/file/16318214736.pdf
    • https://mimpishiodua.com/contents//files/binot.pdf
    • http://liavanhaeringen.nl/userfiles/files/74137749874.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b47a70ce2f0b9ced222d0abba3c27e6e/tivitirup.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/nakuxazoridelotemu.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ae6868351c89052d14405427e6bee60f/45815511590.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608acea6bc49f---1625143868.pdf
    • http://sakem.org/userfiles/files/37069275286.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c1b9332a650d527ad57eb196f325a333/wumixenazajef.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086576838056---73370385676.pdf
    • http://brkvinc.com/userfiles/file/51236329235.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a4fab99b95a565c59f45aca5f37fd28b/vikoxalipasobinafofedukor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=verbal+warning+letter+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16a.bin
3f8c102fa9ccfa9510f60d155d4f43ca54744db0d6fcb18c85475395b1bd6e93
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 10500 bytes
font_01_sfnt_off00010911.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 16792 bytes
font_02_sfnt_off00012123.bin
0817ca8dd2345d1b8147f8b8fdce88144fea2743a7ab184296f0d1643481fe6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 16708 bytes