Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fff9e7e0794c933…

MALICIOUS

PDF

87.7 KB Created: 2021-07-18 18:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 831d1b4ec2add1301f1ea45173d829ff SHA-1: 6dac1f1e916b5eb0b60519b9033bb7690f3fe067 SHA-256: 8fff9e7e0794c93368a1077799a12bffdd67c72f3bc06e2c82be6ada07f46670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary goal appears to be redirecting users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7836bec71214d6e21add762019aecadd/99760140245.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf880669aa---99318500907.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jetimadizuwenem.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd53cb9614e---61098512970.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uhi2411a0olh466fiiakbjtrh0/25494573824.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608969f981744---bidomoxazividukogebelovil.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/mikopevevibujuxonasesojiz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdfb31cb8d---12054940492.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/smh3b5p42pon9gogig6ljftrks/fupevomugafobe.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tf25k9j1v6l131gobrj4rf53a1/65176511288.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28d39688d---tigeravefok.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9aedfb27---23006931228.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7ff88deb6699b1672e93317bd16cfc63/69120284862.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2fc1c847e20c416a10e1dc8450bf5d1b/86001858219.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/zedebisa.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gevogegivawuvegi.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/23628564532.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/41586070468.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/427ee1b040f221e64fcecf391f058034/bodusimu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/uso089ks7sdsi8brciuv9k6704/sufuvofer.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb785b97f27---91928119753.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc9fc33b17---junelifakobal.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/da17860fe0f39d726f0a66cb7c347c33/23980268287.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57f2377ed---nunit.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/caf7f471526489cd8630d201841ad7b5/37958271779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=orthopedic+book+for+physiotherapy+pdf+downloadPDF 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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 17832 bytes
SHA-256: 58264e8635b5f7cb0baea3d456d28843fcb78a4f054913d832c2d3d5f2019fa5
font_01_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 11172 bytes
SHA-256: 400434f064a7474ee0b600fb5c7e1e6eae32ff443f75c8f985c8f49522583d8d