Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78f77c33ec505af…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 23:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1730f1bd4cc00584a3e9049eb50097c SHA-1: bbdee73df17cb3735a6b5b9f87b6167549b55c9e SHA-256: f78f77c33ec505af6079e2b8cc294f8b958a4d5f001a93ec15c53e3f0a1b3950
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or use IP addresses directly, indicating a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d200f2c2---rumikemikevedogabulolaga.pdf In PDF document text
    • http://hanauhrova.cz/files/59423021081.pdfIn PDF document text
    • https://onlinendttraining.com/files/28148942504.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kisuzu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/59140780836.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/95601586254.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/75507197283.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1a01hi389ge05323bqafmj176s/27797306019.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/60492214398.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/kitemuwudinezi.pdfIn PDF document text
    • https://brod-plovdiv.com/images/deneroze.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/74629906125.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/foridowafaxukafiper.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4325d3f2c152a267f66487f6ce9c23e5/kevoxudorivavelala.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/ribajikazuxazarenuvus.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/63079570454.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328bdea6e69---wavunevemebalubugefowunu.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/bimoxalanamudaw.pdfPDF link annotation
    • http://kiiga.ru/userfiles/file/90695685621.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/vegan.pdfIn PDF document text
    • https://hoavily.com/uploads/files/ziduzijamibusomigidebil.pdfIn PDF document text
    • https://zhansq.cn/upload/file/karumusizibovemepupiniku.pdfIn PDF document text
    • https://ip-pharma.net/data/files/27848161696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=game+android+apk+data+obbPDF 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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10608 bytes
SHA-256: f5b16bcbc3c46a825a5f8798172393c8294a121113fb795da76bc5c607a7094e
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 17600 bytes
SHA-256: a7913d83fc92969eec0cc8b83cb61c1182a650a34b1add90129401080658c4c2

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