Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f50f2dc69b836da…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 21:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c80277ed90dc3b3651a0ccbea0ab0c36 SHA-1: f24667a01c27ff9e42cdda691b0e71ccacac4f63 SHA-256: 6f50f2dc69b836da3e9cf92052cf02f87a8923f7ba8b00a2301d81e30d479383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b71b797dd---ruruvarab.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b38c7530de3f690440076671f921dd7/44265615115.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/lixuteg.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109020450585574.pdfIn PDF document text
    • https://apizf.org/public/file/wokupufalobafitepuvowu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4eaa6abd---27236561467.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lruf80snmsgpc07lsjncvbs7h1/sizunijap.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16115670092e58---31533591503.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb581f8feae---18256489212.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/malenekebadelobu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073e469d983d---20346936679.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fe0a1c85b1f0814f50c6bf81de5274ac/88453317152.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160771d448bd32---pezajaxuxeg.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/94431561062.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/29271679959.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jiwapemijaxaxebofebexexo.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/14879616428.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8iubg5jqghs722i8j7kskib6i7/26329408731.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/cecbe32baae4f8dbb2cbc0f69f45d5b6/14729289702.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/zisumomezirogibowepe.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/62668614393.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847bfec181b---dofamokoxewimigis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=frigorifero+indesit+a+class+manuale+d%27usoPDF 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_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10928 bytes
SHA-256: a7edebf811095cae8a71f40adceb606f994e3a1fc882ae982e008099cb98090c
font_01_sfnt_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 17260 bytes
SHA-256: eff0ebedb0ad5c0045da3f6795fd9807ebc89b3da32df7a2f08ac64e617b2413
font_02_sfnt_off00013bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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