Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a3334774401f33…

MALICIOUS

PDF

84.7 KB Created: 2021-07-19 12:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 180948350dcd1022a0d525d7a4772abc SHA-1: ae5eb2dca8c8bfd94565d46fb0cea7854eda9cdf SHA-256: 97a3334774401f332d155bac93ea61bb3f6884b3dab4503d8149e12ac29dee5d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/t9cqiloc9pmof26tt1b4s6h5ji/35242689854.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/fesidukilarolefogezupageg.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2688c9933---kuzuburus.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/71970644044.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/kurawarexizez.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210615204703.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jukozosowoxizari.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/42454965331.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4cf3d4d6650965d528c697d8a17709d0/nutixiko.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/bufewojomat.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/kusifuvefavivukotodaxusu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9422b9be3192a94c9002375ae369c73a/91353917862.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/68fa3ac36543044477828eac7ef86c20/zosagetelone.pdfIn PDF document text
    • http://cycling-software.com/files/file/81956820184.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/lubavuzoxe.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8164924620---tefenijirufukidikusup.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/98697598975.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/71616007502.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/zemulureloko.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/80803d1e843b8bff05b1ffd8be28f994/94976290750.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e4b37be7---poxoxovisituxebeluni.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b07c51ee---95399569108.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/54750979228.pdfIn PDF document text
    • http://dnepropress.net/files/file/vixele.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/95pdqhdu6tuqdccddl0fictijr/kegogux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cost+of+patent+in+indiaPDF 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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 17256 bytes
SHA-256: abf3d9e16f6514ff19586a72c9fff6f63ffe3fca1713176512a312e0e6908c65
font_01_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 10376 bytes
SHA-256: cbc5dbe771645948ef0f13431dd233a4980a884788181239c906905f84038392
font_02_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1