Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df9af6530158181…

MALICIOUS

PDF

85.8 KB Created: 2021-08-30 17:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 895d01f0c659091d09c246835be51a73 SHA-1: 0ee4ea1c49f2b6644a7ce313fb152cfa4b9eca3e SHA-256: 5df9af6530158181147540f9bfe981be10c89cab86cbd13902936ce1340e784b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d12428dbd29c8f4599418a13d938f9be/birozevosuri.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a157763f---44645312236.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b60611aee093f82a9262f7e85aac6414/dozumemosasiderepixivi.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/dogatibogemovabopiroga.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/zolipujawetevepije.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aca46d4748f---40198282053.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd053782d3e---pupuvosipemiguf.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gebazun.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/biromej.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/78956958630.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081072396955---patugotefobiv.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1629133116383283968.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/39509928978.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/nofuvudag.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wapikowexidibek.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/xifojegugakajovu.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jaxolemutexifavalinagivu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/zoguxazumamifebimo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607617d90f37a---vuzufezam.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c884ed2d6---wopavegekovi.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/gulezavufifol.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/wafudogovofizabegakerus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=copi+introduction+to+logic+15th+edition+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_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 19224 bytes
SHA-256: 6ce583eb99b2d960eb396feb55a55af66333118f1b49e92bfde5b66e2969337d
font_01_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 10884 bytes
SHA-256: 7acb8fac50768f002105999193933339d937e54b1547c26ea80db70e765ac0a2
font_02_sfnt_off00013074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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