Malicious PDF — malware analysis report

Static analysis result for SHA-256 74afdb0c006124a0…

MALICIOUS

PDF

78.9 KB Created: 2021-08-07 01:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a729b9f94c27ce71c776977a23e3cca SHA-1: 30948dbdb52a295db3228aa81d8acedfab5e9e12 SHA-256: 74afdb0c006124a0549019e57374fb5a5aa61aa9c48ec0232a02d2028d9f7b39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bioadv8v5k0kopnspmsndaorve/rozexima.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cbcf80758beb38572505806349fecb38/80324761025.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0cebe3cc2f01efa618584421ddd4930d/6074773108.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8bc1bbd26ada633c9b7df17f34ffbd91/gukixujibemivoj.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/47454214194.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160812946b214e---54562212879.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/21198076909.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/93159646263.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084640d27d2f---tisewojaxirodefesidabug.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/janalisinumolegeg.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vv8mmc6r02pt30lvdaafgk3pdr/vufobanudewuvelalebivu.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/lubakilubob.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/255451010601ada7680603bccb4066c1/vubowelukaximeja.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/34068237299.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163777ad2f---45617146938.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ff29f9ddd27220ccec831a385f3bee45/dobibinidixusajewozorapo.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/53291249698.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/54ktnf2dc4a64gfece1gv8g94b/veragaxumapamak.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c25fb853412---80925097410.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822863ded49---jiwilaxotawananagavijad.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3f47860ffe17d003967010bb15fa91cd/nurujiwazonerufepivotugol.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/mokonirawokewakakob.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/fisituwimuremoguxupox.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-03/images/files/11352904894.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146e598c4c---85347685678.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/luzuxova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=oxford+english+file+pre+intermediate+answer+keyPDF 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://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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 11364 bytes
SHA-256: 787c2e9c584753470287daf5a669754ec1a95774cd95170e52acbe08e308711d
font_02_sfnt_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 18408 bytes
SHA-256: 8d0f77ad907765f600c59a23b00889804d6154fd227aca1f4eb0b12d9c6148c1

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