Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cbae7b7b198543…

MALICIOUS

PDF

71.1 KB Created: 2021-06-26 03:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fd9e696092e9f22eefaced3b875b8d6d SHA-1: 45c8df074ea84631e57bd69599cf125e4f475c8f SHA-256: 20cbae7b7b198543d6bae1c98b8be94a1546dce294befbb1811dda84eb782f46
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or exploit kits. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://fitnessklub-impuls.pl/uploads/assets/file/meladagalutitifa.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/31899875047.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/80498196306.pdfIn PDF document text
    • https://clubon.top/uploads/files/gapaxaninexawinadunikikis.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/83c484e9da265c6ff7dec93ef2161b13/todopotekokan.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851802b55dd---xegexejuli.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6e918b60745c7dc64489a369b7d94830/xinuxinibaf.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/2589969112.pdfIn PDF document text
    • http://mp-journal.com/media/file/47104818612.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be64e3b14ce---72306262849.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/vewajuvovibojedepimedale.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a55bba13e5253256632e5a32af9f094b/nodoruwazu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bawivejokegubifeves.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2guge84l562gb37alm7mbudcn2/34162141729.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/temokewaze.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/16ae7623a273423b18439f97a8d92217/14295856056.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/12501474324.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/44570676777.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/12089178763.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/95919046755.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/65861116843.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/29378660282.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0ebebb98502b4bbfd462a0f49193ce5d/57573936373.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zasubevuwa.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/50843356998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=in+my+house+in+my+house+lyricsPDF 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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 10400 bytes
SHA-256: 622affa32d7fce7cdc80f80378b25b3ea424ded225bb5a7fac425f90aab8dc53
font_01_sfnt_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 15312 bytes
SHA-256: fc38e970e32e6a9320fd5edb8475140e4b2550ca70351933ef119610a7b5d01d
font_02_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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