Malicious PDF — malware analysis report

Static analysis result for SHA-256 7334df7e3a8c7e2c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 07:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8f41fa058842bd33ea24d9436dd3a80 SHA-1: b3ee7916e493ff2805ddc1c2856a8ed55b530915 SHA-256: 7334df7e3a8c7e2c1eda731e2b869510ddf3a3668001b6ac7207c2d407369207
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier strongly suggests malicious intent, and the presence of external URIs and link farms points towards a distribution mechanism for other malware or phishing content. No scripts were extracted, but the structure suggests it's a lure to download additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=free+geometry+textbook PDF link annotation
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0758749ca---52965562885.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/gimejupeb.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109010644139383.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/48200688847.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/22778769806.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/jupuwugal.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/ronoredetigegopejemufet.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mosaruvuzexoxavomajas.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/gibudowuluzugemokanixamu.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/18125559117.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/dutuzazefetorarixifuzixap.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/440bcf8dbf9ff973a718d448ecad44d3/powevuwigevukak.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/fugujebikutore.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/brmnngldb4n3mjfq9fm374icb6/xezep.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/3079159749.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/bumaf.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161526636ada60---3932701680.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/zatigoditerenukipoza.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/podakel.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/26824450179.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/dexaromujaxalorakomovogug.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415018b41ac---35319278180.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/51375186534.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/80246503918.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/63480330680.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/59985346531.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_off0000b6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 10304 bytes
SHA-256: 5d31ae308128e71e3ecea2f7ad6c7109a3d4d1770362f156c27a8b15a345eaf3
font_02_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 15452 bytes
SHA-256: a3229fc17045f8cd6b1dfe2434016c9ef865a86a1f064e4a3c8f0791989dedbf

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