Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fa22dd6bd909a4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 18:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aa1de55cdcbfa03add4026cb8652be93 SHA-1: b63a15eba595bff18856863e21bec3a852ee7115 SHA-256: 55fa22dd6bd909a414e7ba072987d75c71090ae280a2305980d36d3370839fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

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://pistant.ru/uplcv?utm_term=watch+avengers+endgame+online+putlocker PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6e8fcd53a3aad0eb55e935f0f284f039/bigubuzogabibiga.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5a46e197---59690872518.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/66834775288.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/lifomurije.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/20629179973.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/20594187995.pdfIn PDF document text
    • https://pokereshop.cz/data/file/99864032275.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613911413393c---67514944158.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/morotolatizosunize.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/74940850894.pdfIn PDF document text
    • https://eternalbliss.net/file/ziziduvoxul.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/xavujeren.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/28213575800.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/38452181365.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/diwenidofudaxusebabojiwol.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/91824618056.pdfIn PDF document text
    • https://spyboarcams.com/files/fiwanupilevedunevibefus.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/gijijosemugugekumivileg.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/kumutanelojideva.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/dodolimid.pdfIn PDF document text
    • http://kammed.com/userfiles/file/jejovolomibifepukadeta.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904130103.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_07E34F311D164DDB.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nazepeb.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/pixaliwopibebimomanosowe.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_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 11212 bytes
SHA-256: 18f3795a38d774fbfd32b473136a7d8db26216a9cf787dbf71775d77ab3118ae
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 18688 bytes
SHA-256: 12bef3171fcac215e2f6c4d59a21e31a764cd8321a9680c5feed2c5b2955efaf
font_02_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1