Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aa3dc8479b1f82…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea3b2a93b03c633e7eb10258580dfb82 SHA-1: 596eb6c1483e18609b7218248d92aeeaab78fc5f SHA-256: d8aa3dc8479b1f82fd2e26c7a91b549c3d52de3218d8b7e449e0f5a2848aba79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=kinesthetic+approach+to+learning PDF link annotation
    • https://combrooncom.com/contents/files/32681861854.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/17173744862.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zagizem.pdfIn PDF document text
    • http://belv.ru/userfiles/file/37161074742.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/53835814390.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138830ce5e59---nagovudidivuzovabuji.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/eaaaad9f1e86ac7a1b84eae940aa70c1/65999747245.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/vaxaka.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/56849941015.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/beroguvoditufubun.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c934947d1---16686741142.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pulugodidemuguwow.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/matawawinunevotanejanise.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/75162051379.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/9221611010.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///42739242865.pdfIn PDF document text
    • http://canvangdientu.com/images/file/18909184275.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/bavowowagazam.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a666dcb669---wolufidipurofoze.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/temebes.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/86685477620.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/vulumiw.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f7e1a18d---takoboviwekuwega.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/nemotezifaxavuf.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/kutinirajogumiziwodilake.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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 16596 bytes
SHA-256: bb2d8865d5570eae3a28b7b4ee39a756f1805bf1c5720196ea3cf69c1f77cb9d
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 10644 bytes
SHA-256: c4dd9bf55d30b9c859095bb1420237b4ad0a23783e8793d1b7678b38475481a5

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