Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c09d10cda083e42…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 03:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f4e0063c98ff14b1f7a6b98226bdeb SHA-1: b6db8b5dcd433ec9364db2b1ad09dcb6ab92b587 SHA-256: 7c09d10cda083e422ec4e4635232cb65fc22d79d64f0c512271c2018623294d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The primary goal appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' and 'User Execution: Malicious Link' techniques. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://pixomot.ru/uplcv?utm_term=super+mario+64+sapphire PDF link annotation
    • http://4grd.com/cmsimages/file/65092476113.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/vimotedegugagizuse.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/girejixerudedufox.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_115403.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/xuritusulosomobibajojoki.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rk0vqv45mkkjud5vkdjf1n2ik0/68044235491.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/10717516013.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/45309977489.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/karowikikezetokudunaxifef.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/xeralakuvovarifaba.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/85799420331.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/vukarapo.pdfIn PDF document text
    • https://curvy.tw/upload/files/bekadax.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/44164841105.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/biwopezoguxanuv.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/noxadeb.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/pitanibogivofakefixigor.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314a8b1c0e3---gaxinibiziwutef.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/kuvodupovapegowivo.pdfIn PDF document text
    • http://fkhd.cz/data/img/mofeziwinatuvu.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/30130219433.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79d5461d5---zizabojotirepifoxa.pdfIn PDF document text
    • http://opersan.com/file/1444261508.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/memipoluwikut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f61b0022b---18611781029.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109070309457975.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/77405900835.pdfIn PDF document text
    • 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_off0000c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 18544 bytes
SHA-256: 6a09965d1bd7784a266ca311d3f552559cb4fb49236820441bd64ba546f6ac2d
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10688 bytes
SHA-256: 66fd683c8ecb246ecc27c86a9a359d85ad202eb20f15954bfc2da0402928e3f6
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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