Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6bdeec47d1faa5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 02:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b16de3b8874ee69dbc03d85de2067323 SHA-1: 22162e9a1fb023c7d7c1d51daf6600685eff72e9 SHA-256: bc6bdeec47d1faa57e48bc75e86e2649bdcb6051d44cbf93f961af4793c0a93a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=high+heel+game+download PDF link annotation
    • https://ancoraeducacion.com/images/94891595252.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3a03e49ed32a06db97deae1454cebf38/benegarapoj.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxegimibiwupejim.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/146e48908e495b92f50c3079a41ddf32/jugar.pdfIn PDF document text
    • http://www.bandungmesin.com/file/92685468671.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fuvunezenurunakibo.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/30133100808.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/71199977799.pdfIn PDF document text
    • https://onwater.my/uploads/file/86958868657.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/likedoguxuxavu.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/xezimorumomifo.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/saronagipufudirale.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86776795024.pdfIn PDF document text
    • http://aven.su/userfiles/file/12284381150.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/48798089061.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/zezumek.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/85563244655.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/50469269439.pdfIn PDF document text
    • https://equinox-e.com/upload/files/judareroxevapenebabaxa.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/fabibilisipodokudumefuv.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/nopibemipinebisejibulob.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/63175301539.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423d72c55ce---59629011533.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/55669054824.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/xopolisekopakedugasokopud.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/robugufaparuzusilefanas.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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 17684 bytes
SHA-256: c5678812570e1e71075bbf614dc7a6f9bd506ffba032b684bee73756772d5587
font_01_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 10408 bytes
SHA-256: 079458220981dd2f36445ef3103082d476eda26914c188f8f3b3ff15065919c8

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