Malicious PDF — malware analysis report

Static analysis result for SHA-256 1579d6cbb51520b6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 09:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f9685d09831266db9d88e6478f90f82f SHA-1: 447b76568025a204d95764084776c259d68e732b SHA-256: 1579d6cbb51520b6a8395fdb3ee4e13ed73a36066599f8670b0bc3c22b068a16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, some pointing to compromised CMS uploads and others forming a link farm, suggests an attempt to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure, likely to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366e1c52b9e---nulabifopowovoxesesij.pdf In PDF document text
    • https://conrays.ru/f/data/45726063397.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/25012416527.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/2671532293.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vemazuxoniraduriboki.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d5859185cec7bf18031966798633721f/wegigupobasedewazidez.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tivibodekejarigaparu.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/dinekilekozawavilepilo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/9511795340.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/futosenoramosotodatu.pdfIn PDF document text
    • http://kechengchem.com/upload/files/94716117001.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/nikevifo.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/pewav.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/73282584989.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/12095019871.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fivv4lmtps735c3qkb5u663l91/49527871659.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/79010426896.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/90600453467.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zezogafudijodiwebefifawe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79fb4c7ca---80556064939.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/robavinux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=windows+7+home+premium+iso+file+downloadPDF 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_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 18844 bytes
SHA-256: bf8f8bbfe1103a57b45d6c158635f12968dfb5effee9f51e444a11ec71bc1c63
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 10892 bytes
SHA-256: 9b898b5756381fd4e0b6393d8c6d05d09bea5fe5b2d18ea156ba4f55436164d9

Open this report in the interactive analyzer, or submit your own file for analysis.