Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c088f918bfbbcd3…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 07:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e946af3d7653e302781f5b9b51aa644d SHA-1: 286f2e911b1fa42ecb10d3865fb50ed3ebdf5dbd SHA-256: 5c088f918bfbbcd30baf146c3cfaaec68253b1be27dc7b37c443ce3302d9fcfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://illustrations.noche.fr/images/files/demezelofazi.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/66974186192.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631898254.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0b33a2b7---33219769399.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/warenewozonuvetipobi.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/kasakonasiba.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/dedakugavudebevozekuzogux.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/figexumowijulubidulujix.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/jabamika.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zuwevowazapu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/zodabibinigavaxavaka.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/pikanabefuruxuromudisabu.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/84813721434.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/vofugutemuwafukolivanix.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/31324611894.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8e4d34d22eb3449545e57afa0dd268ca/51556388408.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/61452018108.pdfIn PDF document text
    • http://partiaweb.com/upload/files/zuzuzokaxirudibaduxuwaju.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af56c83845---xikilam.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/20642498101.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/rarejunefolepevuruvux.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/35127565217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=charlie+malayalam+movie+download+tamilrockersPDF 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_off0000adbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBC 11024 bytes
SHA-256: 45d4b68b955dc00df399c967fd76c0818ef05550de9c7faf7c3c3278902fed8c
font_01_sfnt_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 15140 bytes
SHA-256: 56d74842f17976553a2485f058a51d625e80e564cfce7477847bc0e2af59d57b

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