Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b8eb70dffbde82…

MALICIOUS

PDF

102.3 KB Created: 2021-07-16 21:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3222067c91d3dfb14755455e33066628 SHA-1: 35e6db647b232fd1cacd56b51ac3e6f6c66d9e58 SHA-256: f2b8eb70dffbde8299cd83331daf5b012e8e87fe77120e1862013380e7b431ca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/42df162f45e2cd8e723fbc66998b9430/32355902873.pdf In PDF document text
    • http://northmarking.com/userfiles/files/gapugolagotawuje.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/pevuli.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zakiwos.pdfIn PDF document text
    • http://imi.vc/upload/files/80868916010.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/054349c3b00b465afc257320a0266077/xepezatanulowo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2661fa6d2a338bc5bb75e94dd5c273c1/dafumofek.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/zoguviwebijetogenowu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0585d3e15d5aa5aabf9851866621ae5a/69090909595.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/18929347716.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c637cfe6aea---51344928055.pdfIn PDF document text
    • http://shosholoza.de/file/dodetuwixu.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/63633892586.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9g48msh1qnl2t11a72c5dq71b2/98307592378.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6up4vs40o11a0a89he6ckfpn4l/42039950128.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/44759181792.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/bisozagisuwagunikuviju.pdfIn PDF document text
    • https://chpcentre.com/files/file/9965725212.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/rigenib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=another+name+for+precentral+gyrusPDF 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_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 11028 bytes
SHA-256: ef0d77a2081157ff45229bd0690a52929d18d0bf1a2215abd4a636246c140ced
font_02_sfnt_off00015d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D18 18184 bytes
SHA-256: e90680cb995f80953c34d5550ffc14aa0f24e7ec246083e12ed9f23871f0a39d