Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ade4b34f5b2d5f…

MALICIOUS

PDF

89.7 KB Created: 2021-08-09 11:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0b8a710ec2cc3f84706c077210598a3a SHA-1: 46897970094febfd623b9892cd8708bd4ff57ecc SHA-256: b7ade4b34f5b2d5fbc053e438ab0895610e273a3d1db567db8773a02beb28a51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and 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 0.9986

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://familiegravesen.dk/ckfinder/userfiles/files/30813787794.pdf In PDF document text
    • http://i-dron.cz/data/file/zofodurobozozanubug.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f189f9c897---pakolijor.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/kofekenezugigexepab.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dudarirugonatefudoz.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/68119075330.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5eote1bin3bggb9cnf3abakip8/35194093958.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/lilutitetapoma.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0571117a29bf0507fb3a61feeef0b207/6417587833.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f5fa50ae82bac2a5b360478b8499d7f8/64224498319.pdfIn PDF document text
    • http://dentali.cz/files/files/kulovojunagisijamuvorax.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/92521103522.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/2258292888.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a807bfb0e7a---zavakanazemesirobuso.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9429a2cee2---tapomebasowepipeno.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dojalumopipedawa.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1219b5bb---vumorugazojanemasegepuna.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe56b0dbc7---51608241112.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/fukizazovewumuginekizilux.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/f872489a9b322d3a5b4a5aee4afde6dc/xijixuxabibegekipozozabi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mo237tipcrr1kkh2logn60cej1/lajapifugolujorevorilos.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611010e2057b7---vedokinitidak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=junior+scholastic+answer+key+may+11+2020PDF 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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 19228 bytes
SHA-256: 92fc64da242905bc9a28f3720ee13c6a050d49b05bd73988cc4b00588fc9aa13
font_02_sfnt_off00013e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0D 11172 bytes
SHA-256: babf9ee4b0fba883bf329b5bb782d9e5c761e154f67932a09d4b6d6dff2379a0

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