Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7b7f0a6e54578c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 22:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb39349b4ee7234e6323caace20d1340 SHA-1: 565062a457cc97c10d4ef00ef6b5b8d8e2177c89 SHA-256: ed7b7f0a6e54578c5bec5d5b44d64b6d8bea7a46f4601fc68f4250d78004c581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0cf14faeedfc0585514902aa288ce90d/40714176483.pdf In PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/datajokemuxove.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/20627687638.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4vp4m9qln1bur9gvbojkcnlpfl/tijawirik.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/6730916081.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6219495ff3---86525180986.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7538a8cd---vakiruverujefuwato.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/epucfkijp88qupmvdotdplnheo/verufigutatusaxuzojadom.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/watusedojevimix.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607055068c3a1---takata.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/93733689273.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/33525bd83fd6747eb6e3342134d3eace/80204389757.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/86722433075.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/gurobuvav.pdfIn PDF document text
    • http://machin.kr/userData/board/file/dogosilubixabo.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/mapefobidowolagutunum.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/19312806244.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adea9118e84---latakidi.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/45269835333.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/17808967730.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ae46e435b58bfc3b6796940074e38b2d/xumomigo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8eda62388---47705743590.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/nomuwowabofaduna.pdfIn PDF document text
    • http://balone.net/_upload/file///metakepejoped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=modified+carbon+paste+electrode+pdfPDF 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 22340 bytes
SHA-256: 5ab007b6f1946836935dd93966b7d11b64eeb89bc1a1abca708f5c96e068374c
font_01_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 10744 bytes
SHA-256: d9a0353ea14662e5e3cd108cc94c426a44b335387c8a8a13b4343ec51f31e13e
font_02_sfnt_off00014049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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