Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8606083ae272ef4…

MALICIOUS

PDF

93.8 KB Created: 2021-09-06 21:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b093a709f91b108082a211e821d827d SHA-1: 3f60b739626e483201fb83224520e6eef3963379 SHA-256: a8606083ae272ef483ab7d6784d736ec7e28cf71fe842652a7dda85b202d659c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 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 http://weberstellen.ch/userfiles/file/59947024936.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763d4f19338---13405567747.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77b7caf160---28740403320.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/896c7c8debdaf3a3b2cef39d9b69a13a/sozubo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d380a38d28f---sineberozovisakerademizut.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/xasimeno.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/d4fek6rs81fjujh63bk2ajrunp/71464823567.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/89471594770.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107c43fdcf24---82431336351.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/19459600915.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/lezulonaj.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/88216833641.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc83b5d6f0---mizorunisuru.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/b4a0kd59oveoc4fkq88l9p7bel/74113958380.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/61679368222.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/kogekipasenebafirad.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/vununevesejijubuwof.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/zipupez.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/wezinorowoxa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18f90c8da---14603937471.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7a5500b9---nevebesuwibatitugime.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/67294214681.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac13601d34---34005086087.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/63248564107.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/mupozegavimebuveta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=differences+between+male+and+female+leadership+styles+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_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 11108 bytes
SHA-256: 4093c0c8b7a3682701d5c934b1d1a554e9b47d4697fa5f221b9447a3985b3d70
font_01_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 19916 bytes
SHA-256: 01526a34be5726496637a1e1ffd48a5cc77c84a3ba795fe7e7d76b5459330bd8
font_02_sfnt_off000150fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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