Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9c4c3e16e1a339…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 06:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7763bdb430381a403342c8c07dd2b4a SHA-1: ba4053ae5b1afe068f0ed8579738debebd96bb6b SHA-256: be9c4c3e16e1a339358cd590194799605357840d6a1cbe9af3ffbcceee6f776b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a credential phishing lure, impersonating Microsoft Outlook and directing users to a link hosted on a non-brand domain. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=outlook+live+owa+login.
  • 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://www.aaptuk.org/ckfinder/userfiles/files/voxazawomusemotivobogero.pdf In PDF document text
    • http://tomgiongvip.com/uploads/files/file/jenomudelamunirijemo.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/sorotapiburipebekovevab.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161336693e7919---65984910021.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/90027481229.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/53037517278.pdfIn PDF document text
    • http://synhbio.com/upload/files/wozeguz.pdfIn PDF document text
    • http://ombs.ru/uploads/files/jaboxokitudipegus.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/zogogaxegoxavino.pdfIn PDF document text
    • http://mqskin.com/luutru/files/xajakawaremanik.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/20331397278.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/bapoxiladirix.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/guvubofeb.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/ragulele.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/92385265393.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gijelazese.pdfIn PDF document text
    • http://mfahk.com/upload/files/83106953781.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/69539256888.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/86879963689.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac5a9174b---pafosajokagelixabilosaj.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/pejuxosirob.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130d92f50f66---32421162897.pdfIn PDF document text
    • https://sambelteri.com/contents/files/tovemoninotu.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/lexegerabuxagewiboxemobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=outlook+live+owa+loginPDF 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_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 18132 bytes
SHA-256: 7ffffd4cee3d77aeace682d3d2190a3b93a8d0ad1fff7cedd8e7d892de83d8cd
font_01_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 10384 bytes
SHA-256: a24efca1c7271cd91f96ac87561244eaa2c68d9a690213bb446840c759212264
font_02_sfnt_off00012cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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