Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc7bf15b54eb6f3…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 10:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8144da96681112a4653f642ca864159b SHA-1: 89b112234146145178c2098f82131212fc0ca72d SHA-256: 3fc7bf15b54eb6f32f330787a49c0de2605f7c97a02c4c36bf464d1fadc2be32
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple external URIs and a link farm indicates an attempt to direct users to external, potentially malicious, content.

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8507e3088efb80281ebd51a71fea8836/56694592672.pdf In PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/94478832067.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xigebojokusapuniwojixaxu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/11234185188.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608544c31991d---85527856613.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160de08d494393---10958228777.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/tetipomudepog.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/76836879058.pdfIn PDF document text
    • http://ligneus.hu/upload/file/1876996854.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/aa8c87a1d10224269a28e9425deb9444/vuwamuwo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16084e68c0105c---63984175086.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/1134717508.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/99449898019.pdfIn PDF document text
    • http://adveotec.com/img/file/bidepuxegidezatu.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/vizitipisa.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/17957069234.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/guditigonazevolapon.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609621c4110a7---54397831161.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/59423833251.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75df0ee005---86840882244.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b686a493f---petegamirawat.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1pkio6os818qqf5bjn9hl81ml8/kamuzowugekobakizif.pdfIn PDF document text
    • https://migger.dk/userimages/file/96788819977.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b48991775---mudigigadekusijopep.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/45a0a164934bf0a67d286e251eb1b518/65446746957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rocket+sky+apk+mod+unlimited+moneyPDF 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_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 17076 bytes
SHA-256: f13e14d5fdd9133c8cda05c95e38b6c7f0b5d3116a17b414fb5e356df95c4226
font_01_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 10928 bytes
SHA-256: 579d491f82493357c34cbfa4736ad5c7bdc37ab7785303ed509e467a2068cba2
font_02_sfnt_off000139af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1