Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcd3e9a9ac393af…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 03:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e1b7587f96da7ea8e2a24456b9c9939 SHA-1: 7f7f6861c2aa1e7c74c3327c02ae9bbdc57ab9a4 SHA-256: 2bcd3e9a9ac393af7a9c223b7acee1b24749ea6ca6e0796006151d4118d0ceb2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other domains, suggesting it's used to distribute further malware or conduct phishing attacks. The PDF structure and embedded links are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://krisoc.ru/uplcv?utm_term=are+monster+trucks+automatic+or+manual PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ks3pkolba1fvc1er6ehfeaego/66960793854.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/52182498991.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/kasexot.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/zizarotokasefodetuluma.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/70105785321.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/kapirulisezuzubuke.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/nn6f3heuo3eflpqo9cj1k06qj5/51068451290.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/firigewutorukavudorizile.pdfIn PDF document text
    • https://aspirans.com/files/file/fekifake.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/79086120105.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6c36605c---fegimekibu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ecf4af162---wimofubidujaguwa.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/af02fbc63853ddc1cf06d940bdb10b5c/kumenekib.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/bigomitenusasadiburinimos.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/pelopum.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/82233411128.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608643807999a---77335973379.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086965b2a9ee---48700994907.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f351cb216---dosuleleg.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///22734641759.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/92700020886.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/pezujil.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/befej.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/silakugowabukede.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060400382773499.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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 18788 bytes
SHA-256: 986623eb3d1450805b18398d37bf0f8ef3bd5b9e0d0315b48977ac6bdbc38a01
font_02_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 10564 bytes
SHA-256: e8e14c09d44a437254c6ff67919ddb8fd356d2e09c1fff0dc0549392d492c335

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