Malicious PDF — malware analysis report

Static analysis result for SHA-256 735462470b49cdb7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 00:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42ccceecf07bc8589830b3f446f02462 SHA-1: e932c29d70b6cd8593a0cc8b6104af12494d6b26 SHA-256: 735462470b49cdb72362c53e99502e4633b254f3cc7529e691c844b5c6eeeb5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. Heuristics suggest this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=reimage+android+tablet PDF link annotation
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/73281747133.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/suzirapejapejilasano.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/fufadudopox.pdfIn PDF document text
    • http://www.toptehnik.si/images/jibipiwaguniwutato.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614293a9a1db0---31312176546.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/20504146025.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/94572918861.pdfIn PDF document text
    • https://digireg.li/upload/38002648344.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/lawukexuxuzotuwux.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/zinofigasemetufo.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/sogifo.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/dowusitikovituropuwu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161436b67a4bde---jekerotiketid.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/wukitaresobivixuzofux.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/39891625499.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/xokewikizawibinufe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131404e952e6---potejidabukosamofulenozoz.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/79261780273.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109072325289005.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/nopagepo.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/wavalurarafa.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/38101210062.pdfIn PDF document text
    • https://clubon.top/uploads/files/70587723023.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/giwitadajururudix.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ce8573c008ed57705a06384e5812f2c/48935160435.pdfIn PDF document text
    • 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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 19152 bytes
SHA-256: 06f5d8adb7a1418510e823a3f545fa392303cdbe344f3b3fef23be4097680421
font_01_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 10608 bytes
SHA-256: 76c15536074bc8aa6f3cb128468f1e66c2356f02dc2380f22d6ab187a887f6d8
font_02_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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