Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f822ddf17de4b1…

MALICIOUS

PDF

97.4 KB Created: 2021-07-23 22:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2522a5880cd88f85d1f1d53ee4cf3103 SHA-1: bf0fb2fc69f74f802cffe40e4e0244c9d6ea27d2 SHA-256: c2f822ddf17de4b14409a419084ed29bc84f1e8327fb6a14fc3923082aaedbac
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to potentially compromised websites, and employs a 'password-protected archive' lure to trick users into downloading further malicious content. The presence of multiple embedded URLs, many pointing to compromised CMS uploads, reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cuisinescartier.ca/upload/editor/file/xiguniwozijulovuxaxakexu.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160747a2010aa7---72481574160.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/56355543450.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c356628e0ee---67066052050.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/57096013886.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a57ccf989fb621569ab6fa61d5a2727c/xebekizotimitefadifir.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/punalopiguxidud.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xisikonizaduporubilu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5c414dca---11607568493.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1c15c160832f3ba530602a041f69f56d/45687943696.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c285be8dcc6---moremarazaxax.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/lasokekizomapelivubi.pdfIn PDF document text
    • http://apsons.eu/files/file/57608746676.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/pabqhforurn7b4jd2fjrb3lasd/dunalosegarolojat.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/543a0cfc3f01cda1f5a5cac97624b3d0/74413045469.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7b2237382---16356620228.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/pigaxedumolis.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/kokokirexu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3a48989de274a02ca115fe584ab25f5/74092201802.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/xasefujidebadituvopod.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505224936_1421749877.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2sioh03sm90hpkkcfb67dapssd/zewenojoludifowu.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210722070006.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79f859581c---kutoxunoxam.pdfIn PDF document text
    • https://castel.ro/userfiles/file/66038433574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mortal+kombat+9+mod+apk+download+for+androidPDF 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_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 22864 bytes
SHA-256: f5dce6e612cd6b3380966771e4abd0e1b87d7c722fdb03b109c5b7c2d7f0a25d
font_02_sfnt_off00015e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E06 10840 bytes
SHA-256: 85dfbbc86e78e6a8cc896fedecbc693421dab66965df4813932f560ad513cf84

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