Malicious PDF — malware analysis report

Static analysis result for SHA-256 38af3f7ec5c614a6…

MALICIOUS

PDF

87.2 KB Created: 2021-07-28 00:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f0089ae7d851af837e3f41e474f1b1f SHA-1: 8b03f1ebfdbbcdb737523b10d7c76b2bbe54bc40 SHA-256: 38af3f7ec5c614a6852d774bd8ae310dc5ed2f3af42b4df6a288898da7cef659
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be SEO manipulation or redirecting users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://prospr.fr/ckfinder/userfiles/files/fetinorazaxik.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/uu7c95hsn0dian33hvcrdcj3lp/69559672343.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/sizepunana.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7e28063c9---vizujogevajasinulopimada.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e0ed3a30ca287fc11a1aa2ea7df4bbf5/xirovogulusi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a5635c4fcbbd0d90409c4bbda2e7b90b/79528433341.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afa08fb85cd---jilarig.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/57231801850.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e94109fbe49f03452c1c5efb002271b1/mafoxowaturevux.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/koledobagefe.pdfIn PDF document text
    • https://viettrungson.com/media//Files/kobipezetiru.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bc9cdbb8---riminokudida.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezuvosiziwut.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/44639797125.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/i9r7r7uf20qpcdnpgv2hb3bdmo/xilusalonat.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e0rvha9v3bmma40d1t36h7lrd4/53854043303.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/giet1olqhq2d7mtfk01n69tv17/jojefubuvikiwufosomo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a41cce6bf5b295c408f1322b8e6d6455/99080336614.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/depovemozaminotizeg.pdfIn PDF document text
    • http://garderoba.sk/images/_file/fobevenizemonesabulojupul.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7265aa20---60650932272.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/94851801052.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/26677370166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=arisen+ahubudu+sinhala+names+for+businessPDF 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_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16984 bytes
SHA-256: a628004730aa004666c18bf3662f812034437dcea0875065020c0c666d22876e
font_01_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 10740 bytes
SHA-256: 1a10b2f123324675e611ccdfe5cbf0260dae4d2fbc44c139a4f141cf49ca279e
font_02_sfnt_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1