Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7f7b95b69535a7…

MALICIOUS

PDF

146.3 KB Created: 2021-07-23 06:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 130532e2fcc8958402851c77e77aefd8 SHA-1: ef9bc7718c602195d1fb11c11838dd7146f829cc SHA-256: bb7f7b95b69535a714b7969a50cf9e158dc78f2c46d38a5219b1dcb6d3854866
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. The PDF contains numerous links pointing to compromised websites and potentially malicious content, suggesting it functions as a link farm. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rebizplus.com/userfiles/file/61413035837.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2btqdnfm4l8n0pikfs08t35nqd/jafanevo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/26774220327.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/46el3ngele3s851tbfvh96l2tv/69076894122.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef50f0482---kamuxemudubu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/73396381820.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/bewogofud.pdfIn PDF document text
    • http://ashioke.com/images/library/File/roxopuwapodo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qja021shjkbt0v3rdfp0ldpus0/80204556798.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/82604809967.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4126126af---46488567354.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49163613568.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/81042364503.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0419d0c64aa3b7071caeefe557baf56a/dinebilivax.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sixavubibonizebemitakoz.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a45e1d614---84138090306.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/80931761485.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0c78e17d---80294980674.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607454c18a54b---nunanuvurob.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/levidedezaganeluve.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/mejuwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=painful+distended+stomachPDF 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_off0001d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8F7 19340 bytes
SHA-256: becbe0d5e1027bd24c41676b8fb04e5de4b2e671eb8f2257bc40fab941e66b44
font_01_sfnt_off00020a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22228 10740 bytes
SHA-256: 29df01acedbe78f03025fe767f9bc5825e76d7dbcc60f7ed16ec2288b3db671f

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