Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb5a8d0a5693211…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 17:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43df81f897c452de5c4476b59eaf940b SHA-1: 5c1614a77dddfb3621a40f6131d5a6140b96a312 SHA-256: deb5a8d0a569321103af6ed3c0e413245c3bd9c383c772b5d098871dd00bbaa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or leading users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://transcash.com/ci/userfiles/files/dezowetor.pdf In PDF document text
    • https://machnik.net/ckfinder/userfiles/files/woreberarenuf.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/wobowotegiwuva.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/fepasabozifuguvavam.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a163f1b6---nonejobo.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/20984162996.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ddb5b41c---bijosos.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fnel74fsndkjpp79b4v15k1n77/mumeteme.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acdefe3d574---48417481926.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3634c844a4---41921045526.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/14002410866.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/20644028412.pdfIn PDF document text
    • http://piecco.eu/upload/files/52614132340.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jft6r8dr4ehn1o36sdbug9p08t/48850793177.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/12447726438.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607924d6d5be3---guwuniburuwu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b9fd80a5168dfaa4079e6fa689b72564/vejozefirulezunamiwizu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a26327424b5---xoxifewakatumotib.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/30421369303.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/sidozasom.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/42066163765.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/54913408281.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210823224346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=advantages+of+lecture+method+of+teaching+pdfPDF 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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 17544 bytes
SHA-256: 6ddc53308e780e7adf6cbe7541ea997c0008c2c6ec1c6b38723421d8c5c5684e
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 11212 bytes
SHA-256: b9960d6be40d511b1f2decfcee3e98cdbe3f3b0cf209c28b33cf2e2dab18627d

Open this report in the interactive analyzer, or submit your own file for analysis.