Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb7f341b05c640e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 08:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dde803624c7d6fa43c86971f18186103 SHA-1: fe87a13bfd3f486ae7d1e4751338cf12d09c4ae4 SHA-256: 8fb7f341b05c640eba82520da0f658e6a5b1ff729d6c8f70c5747048bd36df33
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple external links, some pointing to compromised WordPress uploads and disposable hosting, suggests the document is designed to redirect users to malicious content or facilitate further downloads. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://stensoproject.com/userfiles/files/41053638732.pdf In PDF document text
    • https://mimpidia.com/contents/files/6462430803.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/75628152155.pdfIn PDF document text
    • https://blugarden.eu/file/85277609211.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/dozofukid.pdfIn PDF document text
    • http://robbes.nl/media/files/75979652682.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tunobo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_5D23BA539CA3C7CF.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/duzadidon.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/57142528144.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/maruvirorepitosifimapu.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/3643504896.pdfIn PDF document text
    • http://chikatere.com/Upload/files/36420872285.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/zedimunaxezetagonutudule.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163072914190749755433.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/falunosofolenevozapi.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/3296860850.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/69961190434.pdfIn PDF document text
    • http://unsersohn.com/images/file/febivuluj.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/tapepaxap.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/96267344297.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/mirixari.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rufrvfoh3kaddj9169mdfi1oo7/getoxinegimowupirepazun.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d0b82161a739aa62d243be14bbf86f76/wejunolatusi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f08dd8124---99787445999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=iptv+smarters+pro+apk+download+urlPDF link annotation
    • 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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 17884 bytes
SHA-256: 3643b19f2f88f2e054ba8f51a2a1500590b22a70df79f7f830c8bf126d6ba75d
font_01_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 10756 bytes
SHA-256: 28e511057a8d31e89580f07771be08a0b63c280e9122d2e4290a49c7763b6d8f
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1