Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b416c920b72a1e8…

MALICIOUS

PDF

75.4 KB Created: 2021-09-23 08:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f762ff820a38b693be4cef3fe041612 SHA-1: af2a9ef80dfb9a2f00298f6419a032c2437ca05d SHA-256: 1b416c920b72a1e8c190a5704791aed28ad19690d3b235e7c65e14e572e046f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or malicious websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs suggest an attempt to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://poongdung.com/FileData/ckfinder/files/20210909_5C2D324FF4EC1162.pdf In PDF document text
    • http://dyneco.kr/userData/board/file/zesoronidawunimozozuraj.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109221816565394.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/matusalixigenopo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xiwefixaf.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351200d5497---49954389824.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wodamuxamajo.pdfIn PDF document text
    • http://kammed.com/userfiles/file/lulezimukupunowede.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7432f0e0bfb0f945e6f70c63b51df1a2/61469632236.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/48506946164.pdfIn PDF document text
    • https://manenshop.com/upload/files/62708163358.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/4987247325.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/redejerud.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/99296210778.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109041359141133.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/95840166700.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/jexiluvifamiga.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/o672r5pr57tkqj1b48l4qe4i43/lavofenuvifalesari.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/pafamuje.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210901_3E83AC50BEB25AF8.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8b8ce6dc2---38103242778.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/mosixugemivafijif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=subway+surfers+game+free+playPDF 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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16628 bytes
SHA-256: 35e7a50add7eed8ae385114f4ab738896d0487cce9081e6b7c55f7ce39e03ddb
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10804 bytes
SHA-256: 8417730a64982b80cbdc279b025d3fc8a2533f4f8fafdc0844283d186b1be7d2

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