Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3a616d4fe76984…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 02:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3698c1e7cc942955be7cfc48f5ecaa17 SHA-1: f9a4b61f40736e13ea72fdb7825031ed27ebdeb2 SHA-256: 5c3a616d4fe769844741cd50e1af9866ea2b9492b13c813749bb0800bde29922
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.verimevzabavu.cz/ckfinder/userfiles/files/75232378655.pdf In PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210917_F0B2C8BDD2ECDD56.pdfIn PDF document text
    • http://rvhifi.cz/files/file/piliworilixebowujixujas.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631764632.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bopobatufegore.pdfIn PDF document text
    • http://strandedtattoo.com/file/68522085307.pdfIn PDF document text
    • https://phnews.ro/files/file/gunamujin.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/sadiw.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fdf1fe09---babetizakofadugu.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/wevupegazopa.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/53847928784.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67ab0e256---97822062129.pdfIn PDF document text
    • https://spacio.hk/attachment/file/gudekelufivezunigirafodi.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/magugirigixe.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/27527611369.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/vuzunimebadomafajorit.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5df943cba5804272a90411dd0ad4569c/gonub.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/18990530790.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/dugakiwipiwemejox.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130977289b81---46180513674.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/xamonakofaw.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/37446340206.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/dumiku.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/fojexawelepiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=using+webview+in+android+studioPDF 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_off0000b1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 10776 bytes
SHA-256: e3c8890779e9d7ee88eab5674fd9651eda7022eea2fa1e8b2e702f3d46ba89d9
font_02_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 15556 bytes
SHA-256: 129b77270aceab072fba949d531b3bdc4adb2e8d07c77f1c7ce23e81d048d73d

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