Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ee2118f9f65a1f…

MALICIOUS

PDF

73.4 KB Created: 2021-10-13 15:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 510e6fe97cb537975f07be47fcff1c9b SHA-1: 61ec905929db1e0a4271b7f5165ec3c73c3e8b13 SHA-256: 74ee2118f9f65a1fe7d61c7ca6c0704c03e4e6970e567887ec1c75b90ec4b77e
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, several of which are hosted on compromised WordPress installations or appear to be part of a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness. The presence of these links suggests the PDF's primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://chcial.ru/uplcv?utm_term=hierarchy+of+class PDF link annotation
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/eaf728e14e1a4463fb26a872b7299eae/31418216605.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/68852313252.pdfIn PDF document text
    • https://kultmotor.hu/images/files/xaseg.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/41225888028.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/49170870408.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/3e2deeff3dd8669cee9822cb4a0347cc/zimeg.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/mexej.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e25d977cd1---zelulexupedi.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wobivawogexuzix.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/25174427712.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210927_234216.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/94521260647.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210903132649.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/30181885644.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/gemaden.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210919_9A12F379F9ACD611.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/80966632664.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/68192785623.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/labiparimafewadisalalidir.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/42126450855.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/3492811981.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/nalifefipur.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/62822958396.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///40732515355.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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 10336 bytes
SHA-256: bf435d3303d236582581601f5aa05f42fbde09b45709b888d4d4829912e56587
font_01_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 16076 bytes
SHA-256: ba607914d1508b605ab46976543cbb488926d4f14a0e933a697c7e43a231ccc9
font_02_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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