Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bcce804e39d847…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 04:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30893ddefec8d1db992fca6e0681210a SHA-1: dbf01f762dec510d8c67a4d926f45d1bd3b88e31 SHA-256: 80bcce804e39d8477ace9db34aecbeebc7365aa0a32c8c2a1e091394a3f335c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'LOLBin token sequence' and embedded URLs suggests an attempt to execute commands or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://inwebjor.ru/uplcv?utm_term=aspe+plumbing+engineering+design+handbook PDF link annotation
    • http://katachizu.com/img/news/files/89695576676.pdfIn macro / runtime command snippet
    • http://wish-pharma.com/upload/files/5382015347.pdfIn macro / runtime command snippet
    • https://szpital-sulecin.pl/images/fckfiles/file/vezimidagorexuvajus.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/xefezojedufinup.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zixonaxul.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/20233282331.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8vtsmgl28nd55irit1g0hdfubr/wewebozevujolakukoki.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092403183251972.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/revukufavadufugonibo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0eafd118f---wasow.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/95095230875.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/77065421554.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3b1e90b9---fogujakakuwed.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8d1e8672d01f029120ddd940f7d6799/wumufigasetevomukasu.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/69936685126.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/dopated.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/50784480617.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/23942971525.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/84845193801.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/dunirikekinikuwajiwi.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/73276573532.pdfIn PDF document text
    • https://conrays.ru/f/data/lijedukopepijirojip.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161476707ee2bb---posipivogotunokuzawis.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/88181447123.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151cd21a1fe8---sadapabox.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_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 15188 bytes
SHA-256: 434f972db33d2061bb8bb29a8e9ff09827f07cb8c3cac9759e524799cf975ad4
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 11052 bytes
SHA-256: 18698cf57fc1568003c5641e2168993ffe1c22bf64ccc60b26dfcdc40f5b7839
font_02_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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