Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88c62cb73003622…

MALICIOUS

PDF

68.4 KB Created: 2021-09-18 05:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c9508586bd28080b44a72dec79cab0d SHA-1: c3f9c92a3e2400b56934788be12bdd5d0d8abaa7 SHA-256: a88c62cb73003622abbe0b9064c5146fe34949a1a07b835de17477e5c25ed9ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://coretry.ru/uplcv?utm_term=video+maker+app+inshot PDF link annotation
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/jipej.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/mejimanoresufu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614453756a499---fabanirizetavati.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/38593582380.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/66a7e58802107d9a4c9794bd3c596a3b/85082729457.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/74734974471.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090812423773499.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fujowisinafovotifi.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_c03cd.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/movuzapadezozo.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/83324779396.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/44bafcb2c087a27b109431d1f55ddc8c/kodakanemurobefigigi.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/58335362429.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/76731689313.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/wopamujusalelovazegebasug.pdfIn PDF document text
    • http://446888.top/userfiles/file/38914033244.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fipidowixanelifejegabebus.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613c81d676759---vejomunejazozilu.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/99033875253.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/91206622342.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/sadorojik.pdfIn PDF document text
    • 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_off0000ad02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 15336 bytes
SHA-256: 74387965a9e928e3021a664163b88134e3995f9a37fc2b46b8ffecd6c007c8b2
font_02_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 10672 bytes
SHA-256: fc9ee441852565237258940a3f160f885147b9103d9d57099082361a41f53811