Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbab155bb15a6d8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 21:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bd588521f521612ad0e748db7b84bb2 SHA-1: f77dcd5133f5da5cac3ee29f1c388186f667c94d SHA-256: ffbab155bb15a6d8eb69b08762df6df805ecf94059624892e269ef8513a9cd22
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, with one URL specifically related to 'outlook android sync contacts not working'. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.ebenisterie-burette.com/ckfinder/userfiles/files/80806760876.pdf In PDF document text
    • http://cartopack.com/Images/file/98396942747.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/xezasodijetulaxurokupubex.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/gonebim.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/88046764173.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/22646536716.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/xelanesowokitisikebos.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a5b912e7---vadibemolosi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/befoloven.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/molisiwijovisi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142957c0631a---95497731562.pdfIn PDF document text
    • http://strap.sk/uploads/file/kojozobexulonixigos.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/90949172880.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3af00577---gesereke.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/90581312486.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/nenaniradizeruwonofumaguk.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/71344989466.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/62086735058.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/kodudizadogu.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/36761308421.pdfIn PDF document text
    • http://wawa757.com/uploads/files/begovukukumelusalugorudo.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/viwadigipesekanarurijomok.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/6720584885.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/7858351442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=outlook+android+sync+contacts+not+workingPDF 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_off0000b8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 15716 bytes
SHA-256: 28fbc5ea215e923c27474e41769f7eb018ae2f59a2fce6c3dde394eecec86470
font_02_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10832 bytes
SHA-256: 9dd4babe23ee33ade3ad42f705a1d6a409355afe0f01ba60bcfefa229d494447

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