Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22567c64e2576ef…

MALICIOUS

PDF

81.9 KB Created: 2021-07-03 07:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 286050529e515097d7c8d545c551528a SHA-1: c6b0d249e64a9a7b950a01333ae606ec69fa9694 SHA-256: d22567c64e2576ef1c6d8572dc6447beeeb46f466fa66e2e07f582862813cb34
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://hunde-katzen.at/soubory/fibigexetidejopenavazu.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e3149999---bamarominafetuseliden.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/f92mol4p5gamm8t766idopk3gl/monoxexujifumotoxi.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/85807494023.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gpesncahkjpujplqfe7057l30i/85959658873.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/fuvanuragawero.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842424ca95d---38379165101.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/sijubu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tovunilim.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kanavemorololasabumor.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/72989987517.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073a5e2667a4---naxapiwobasovarekoga.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/df77a29dcea3f5207689ecff616be671/90783421186.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a7ec3df31c228db3d6402a7a38607dca/sutilagoliwuwoluzovenam.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160790b5cbffc7---91153832400.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/26540008024.pdfIn PDF document text
    • https://biocoils.com/img/file/pajemepex.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/mavodeleso.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b5babf5c6f6---nubijuk.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/28136455357.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/26684333429.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/81723558386.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/10184820133.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/2608232968.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3560bc2aa04c717b7ae4bf499dd40d8d/69967799305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=5+ft+11+in+inchesPDF 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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 10096 bytes
SHA-256: 766cd8357c8ecf0dd31e74f2663b51c9085cc18bd98ed794a34151dc5cc4e009
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 17416 bytes
SHA-256: 2ee86e241c304795eedc7e49b38fe9b9ac1c11f31943c10d1599338309a299e8