Malicious PDF — malware analysis report

Static analysis result for SHA-256 39090f6d5f8139df…

MALICIOUS

PDF

87.2 KB Created: 2021-07-26 04:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 60df26b2ec4238dd161521b251728ac7 SHA-1: 6a2bb2e693b92c95d4bcff4d8f0049bc01de18ed SHA-256: 39090f6d5f8139df1c0dc23b1d53de0ec08a0e01d71856831642f52aa8b8a21f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://oldtimerclub-thueringerberg.at/images/file/kigelujejokevatal.pdf In PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/a1e797184c199bed34b2b52c71ecaaa8/52587781828.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/fujavug.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/zazakumofubimagow.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050222233573499.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/69123988586.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/82175719433.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721129b875c---13510584897.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/63884ac4dbbc6b23cfc060f3eda29eea/94090085539.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e276704ba7---lulikanevifalasivi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd46b8ec73---16297777935.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d0b1ec17bb9160f902b307acd2488fe8/69652474237.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/udl3g5tuvns5qqth2gduh2990r/64673148020.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/d98c7f714dab6215a517471cbcf095d5/5652031494.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/664c3aaa6734c21eb68812be7f1c61aa/40590869577.pdfIn PDF document text
    • https://doitoutdoorz.com/file/jP4JXeYLcD5uTdeo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092501c27217---25592506305.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/77908231435.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/tedafitabakusereselevif.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084408611de3---dojadixuxobigoduvupo.pdfIn PDF document text
    • https://geniodelweb.com/file/ruluparakena.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/ninuforako.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608477eb6ae3c---nozolomugezabebizijekoge.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/degugumuvevan.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2b0a3384---duxuzumilotunawejin.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a61ac0a176f6d7b8af2da5fd8c63c5e4/7701137020.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/60603903726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=modals+of+obligation+and+permissionPDF 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_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 17172 bytes
SHA-256: 6aae70a4212c551ec022d1591544cd470bd98ace73150955cca915d1e71663c5
font_02_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 10976 bytes
SHA-256: 54dbba7aa1420f3da587efbf51a5b653e60304de40735d58044c1e524c068301