Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49edfca18620b8f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 08:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6910e4f5fa274139f2fa4ae433179dd SHA-1: fa509a8fb94400143e6c9af7eea85000e0bc5974 SHA-256: f49edfca18620b8f85d21083ff5ef474a2a40bea9fa6060b21b22118e193decd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to redirect users to malicious 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://archism.ru/uplcv?utm_term=juego+the+king+of+fighters+2002+para+android+gratis PDF link annotation
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/87242669383.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/dovibovodokedajabovujawi.pdfIn PDF document text
    • http://land89.com/ckupload/files/regigot.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/u2fo36qb81k4mgokvrop06tsv1/potugujatazujide.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/2218277224.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/luwugiwelotebogim.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/46526268094.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/48173261093.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/6174352785.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/napikakufilorobasi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401e08f3240---pijugamono.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/rufogaxibir.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138460f85622---2350932737.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/jebiguzalo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/00cf6b65164938f3524f22105173c380/zajobatekuxiv.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gisuvumekaropevowasidix.pdfIn PDF document text
    • https://auto826.com/uploads/files/tovabubetosiroparopob.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/jiked.pdfIn PDF document text
    • http://kodemari.info/data/files/bimizawumexezuvilek.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/36874399172.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/384092b26b8a905e6d818f2daca32bd9/7743256030.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210910062027.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 11156 bytes
SHA-256: cc112464da71b4f6fc9947eacd4a88856b827fc0a4031ec44272a34f4f90fe4d
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 18644 bytes
SHA-256: 29469af7ec3befb18b90f443e9e04090bc49bead2630b671a7845606a2a4184c
font_02_sfnt_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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