Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2415edd8127c52…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 15:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 746c657250d1a13d809799dbb5e7c76b SHA-1: 0eb1fa63c3ad5400115584a26d381bb43d46e8a2 SHA-256: 6b2415edd8127c525482def71c5f003eab0e8902738bf00862c8d4a9dee7c34c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown-reputation URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=12k+budget+phone+in+bd PDF link annotation
    • https://megatekspb.ru/sites/default/files/uploads/subilo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310857e6801---1588455193.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/72638117796.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7917c2cfb---29729110709.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/10940923372.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/53248628237.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/42551152354.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/12377773779.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/defajanuja.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/bigupelamewogazuvulizofa.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/68768258391.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/4873916733.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/87146775896.pdfIn PDF document text
    • https://activepymes.com/pub/file/13951006140.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/68085326147.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/25155066133.pdfIn PDF document text
    • http://indemo.pl/Image/files/rumutoligugi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/j6mj77b04su7kme9iv57l8p1gr/16755785415.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/70202232027.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/54737758931.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/63700455156.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/1399018897.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/zipuwowinezapinifugom.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/tuxaburuvagof.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_off0000c189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC189 10604 bytes
SHA-256: cb766fe81d627c3a002251b7047c08a09ecff84181615745b8140ff2da68213d
font_01_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 17620 bytes
SHA-256: e415ceaa047b8a522e0dea7cf06a1c119265fd62d8278d505a7c9eee64871595