Malicious PDF — malware analysis report

Static analysis result for SHA-256 b059fb0ac1b2350a…

MALICIOUS

PDF

100.4 KB Created: 2021-09-01 07:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18a93995b4fe98643e8d5e92231a4ca2 SHA-1: 037f72bce8f715b5bd55bddf4eedadb0e5b178b6 SHA-256: b059fb0ac1b2350ad174d225f85f8a3080197d45c17eca1d1a76bdecb9ae5776
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on potentially untrusted domains supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mixogazetopilefuger.pdf In PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/tasujidujibuma.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d53008053---supatutokefabununobaluke.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd870b6edb4---wijekenad.pdfIn PDF document text
    • http://dztechfin.com/upload/file///39171311939.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/96984157514.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/lixazolobuw.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/gomekarimumedo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/83587701885.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/58709911335a54bcab05c2d653752ec5/tewawijotezur.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7d58aa9ae9f9d840ef2998a97d31d9e4/1741309562.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/dibojuvid.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c713e987779---28307617641.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/35247172534.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/vigapuguvogitomufagu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a2452fb6---7250850470.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2212154239.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/56782147083.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/50888147022.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffdef9a3cd---15361738928.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/7845719082.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881ceeacdee---rodebinovudis.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/idm9tg7uvd58ecv9t9mrmhi2o7/bomudigikufudubokuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=math+double+digit+additionPDF 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_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 19028 bytes
SHA-256: f469038f72415352559893d0e1b40b1841462709cb5a4dd989ce6412c0bdfbf9
font_01_sfnt_off00015373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8A 10492 bytes
SHA-256: 2ca429967d92aa86167a2493f5139af03f3a18121a1795f311109939fbeedd5f