Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7303a3c797ed954…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 09:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4c63d21bdc9f693d7a30f743300c8e3 SHA-1: 5286d045b423878045884fb08b8a103212a6c510 SHA-256: a7303a3c797ed954f95f1c5a2a8c906e811620d9f655045335ee07783972c8a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and disposable hosting, likely intended to distribute malware or phish for credentials. The presence of external URI links and the overall structure suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=the+walking+dead+survivors+apk+hile PDF link annotation
    • http://sevimticaret.net/userfiles/file/tifazafov.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/28598106522.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/71809382416.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kilimivurog.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/65844528702.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5342ae8d18c54d3cc638499ef52c4ec8/tubodisufiwojogigeje.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9a05ca00cffe6efbbf132e54b5a2df27/tubawimafufusobino.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/lamobilezogiluf.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/63405483267.pdfIn PDF document text
    • https://paradigma.bg/uf/file/91170552929.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3e0333719b513b659773cf84245f350b/jerajatovafezu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/39829323481.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/dasizidaxiv.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/34062351537.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/widariwe.pdfIn PDF document text
    • https://tekartltd.com/upload/files/72847209611.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pudapavomulozupovel.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/91816330652.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/10019320231.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce986e138---30516346755.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/44934567478.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/6498413121.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_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 10880 bytes
SHA-256: 95432541b75dc0cce0bcbb6cd260138c573d3b426889626a6eb2d4f220da25b9
font_02_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 19044 bytes
SHA-256: 339ef3d6c99eade4741f436b7bbe351c07b1f5efa5ead184ae019752f15bff7b