Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcd8bcd02551013…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 17:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63ba63cacf1e2e2e55f488f979f461f8 SHA-1: 87f6922826d00316189063291b1c98b4077005de SHA-256: bbcd8bcd025510138ba669a68441f63c3e10394aca7cbd9f6651fef300e92096
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=3d+game+sex+apk PDF link annotation
    • http://elitsatodorova.com/uploadfiles/file/21446129179.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/87805149283.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/21723949561.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/41305206658.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/89735699889.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/zutagaxajepimujesokumisim.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/doxedapef.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/piletowigirufabumesepovap.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/99nnis59qs52kfdgbk9ko29pu3/pakegizuzuwenidufega.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/jedudumozuzogot.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/kegexomofefotin.pdfIn PDF document text
    • https://kuepancong.com/contents/files/11460836019.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/sibabajedozosik.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/23636812384.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/duzuvoparavaguwosel.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/78895452517.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/pikivubimetitoseb.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/sisupisetuturaxolarut.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/39846337419.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/tugigov.pdfIn PDF document text
    • http://jawarakreasi.com/file/lutezigibiwajul.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/00f5486324ba293488c3977804671a6d/dedofejazet.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161327cedbff2a---74740562792.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_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 18456 bytes
SHA-256: 77e5a6bd23a9918426ef4d17ecdd02de0144b435ff50f5bf308d9682e1d31ed7
font_01_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 10444 bytes
SHA-256: 893d50078ffa5fcab875f24aa7b095fb88eeca6a37be64959bb4b22876115479
font_02_sfnt_off00013aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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