Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0db429f8f443ced…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 19:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62a390906981099a3225a0d49df9714d SHA-1: 40ac3679a68ee0c61d9b6b032c28dd6f8fa40d26 SHA-256: b0db429f8f443cedb0f197708a9d94d53dbf840e3e9e1d001b328a00ea838305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=android+phone+as+usb+stick PDF link annotation
    • https://auto-rujo.com/images-editor/file/97695576780.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9228149df---33742171387.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/80289554385.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/75598897453.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/jafow.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d25ae3773---sagidesuxi.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/48273967836.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/tunatizivebipa.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/81867279133.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/niwozumadelijekumo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/kajoxuxativasani.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/nekiralulesagi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/vogozinab.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/38891250675.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/gupizama.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/17940232141.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/barupemujolukexap.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9f4dfabb5ccec3f79d46575aa6158198/19863627844.pdfIn PDF document text
    • https://scalping.ir/data/files/file/tutonaxopalavagegukobi.pdfIn PDF document text
    • http://darec.sk/files/files/bezagujejisasufuwuj.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210919222709_1074674616.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/jifisibikemalovir.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/93641221261.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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10880 bytes
SHA-256: df4016460939471dac93beed8456e42f710e2e3b35674688694abc1455111618
font_02_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 17656 bytes
SHA-256: 0f66f567fdbcfe4ab51d0db9a2d1fcba10e46cbcb73a3d1998ad4456006bbdec