Malicious PDF — malware analysis report

Static analysis result for SHA-256 19af40f94a1917a7…

MALICIOUS

PDF

83.1 KB Created: 2021-08-11 05:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a73f67c68eef1f8aecb6e501cfb45054 SHA-1: bf5da3426855913d9a2f92d534b65672d1bbe120 SHA-256: 19af40f94a1917a79199a3859ba82ec89c5a4ca7beb7e3a14e1b460523b9d2f8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and numerous external links are indicative of a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=comentario+colossenses+hernandes+dias+lopes+pdf PDF link annotation
    • https://laughteronlineuniversity.com/images/upload/files/69657840020.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/pamij.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6eeb4d44c6e1bede20bf99035c9b9414/25809746311.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8aa914df3---mimebe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743de62e7f7---lepagojabojafuwuligig.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jizapepupewi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6ccd220bb46e80e64cd281d238f59708/kefozomomogipoz.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/46762251136.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/e4gkqj10ajvqbdfff0p94nuda5/21168613962.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86097279839.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a64679fb8---58881706696.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc2f55f69---nuzuwika.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf6940a63---wutugabizefebabamiza.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8adc580d3---diregilujirodeziwefovug.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609923ec0d9d4---ziwajasukagurulemuregefi.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/pifogajegaragodivalak.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///49133837120.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/dosujivetavera.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbbfa52bd0---lavavaxikowalulu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/bugemabixatugegosum.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/24398098214.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4f02303b---tupipusikilovokejoxof.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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 18720 bytes
SHA-256: c7ec8fe07add562f51d1aeb2c02040df7ea933134fab283021ee69e4df2a7232
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10916 bytes
SHA-256: 7e9af8232c76c4fcf3f0dc66461a70f954c53d7bfda04044ac94885a29377cfd

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