Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca680d73aa142888…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 08:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0fd9138e5cbfe722ae5ec9762b1dd16 SHA-1: 410a9186c232d29d620742b47c2575368e8057e3 SHA-256: ca680d73aa142888f225362a74db9cd796979a1fbc46be2e39074e75499724eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.itidharamshala.in/images/uploads/files/7126903765.pdf In PDF document text
    • http://iweldbot.com/ckfinder/pho/files/83368008880.pdfIn PDF document text
    • https://robodom.si/files_vsebine/77021070795.pdfIn PDF document text
    • http://retailcop.ca/files/3828446094.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25832391868.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53e24f234---tesisefega.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/79959679615.pdfIn PDF document text
    • http://exima.kr/userData/board/file/limevonosibaxor.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/57758687333.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/69474150004.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/faruwejer.pdfIn PDF document text
    • http://csp.hu/editor_up/71496508511.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/72176868367.pdfIn PDF document text
    • http://quetthe.com/upload/files/buvujafogimogubuvatik.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ad1ce9e5---39264399602.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/91995028241.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_43718ED485405764.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/tofawiminupotal.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/40531118881.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/65198927042.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/85653173083.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/088017b6d2818b1d48b0635dff872a0b/2931082543.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/4082af9aaa4d5790a1ae088e5f7907a7/wujikinewumufutuzemoreta.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/rafureravapazogukoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=unlock+factory+reset+protection+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_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 10828 bytes
SHA-256: 57db2acad4af56e562f7adc140ca2483307bf9e617e6ce4b476986bd94a4e440
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 18512 bytes
SHA-256: a7694c9380cb11ed3f7d3b3f7a155f1e1644d50278b9e0b2cd4267d000d1a041