Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d135366f45eb2a…

MALICIOUS

PDF

83.9 KB Created: 2021-08-03 22:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 597969e52254151cf93429c91640ea65 SHA-1: bd0137c5967f4199657f08d8d5d581d2879ec9d9 SHA-256: 13d135366f45eb2aab9164a5b7f03e4ebf4a72e0716824553048453de6d973a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e06968ee---54399061161.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/11133987166.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210725_3B6C812A43C2B794.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/petitusimusegajobaxo.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/wikawu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7eab3a40b27589fea9d2d7e5d20a0f2d/razuvet.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/73333029086.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/15808713860.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/rogik.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/da36b03f6a966fa31fdc61dce76eee9e/81281794177.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/60093766185.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6587bac0c2---8293128495.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/imfgc4e2s4kppdpmdifa86tohd/61287616848.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/54874584061.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3c9a87a9---40515289358.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1f7b907b71dfb54b650ab90e6f37848f/41970034593.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fokitigur.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d7ea6272a87b90de685ececdb382843e/sopomodejabiz.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a6ac70259e9759dc33926cb4731b100d/81905340459.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf9699494---xiwedogesix.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/23385821561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+crack+wpa2+psk+passwordPDF 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 10424 bytes
SHA-256: ce67ddf3318f8285859de412a70d973d519224cd176b4ed0639ee502142eba59
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 17560 bytes
SHA-256: 6a178c3fe1b5705fb60526403d639069036507865d5d6aadfbb78170af8d8609

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