Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d0260f4238a7ea…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 02:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59e7cd141a2c257cb248d909faae105a SHA-1: 3e0acfd3978b1031b871cdf79650d6f159bca94f SHA-256: c4d0260f4238a7ea80e20c53ef9bd4f13532eb7e5a77b60fb236e3361ce3b89a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://bestbuyfromindia.com/userfiles/file/xivewobaretalaw.pdf In PDF document text
    • http://lmnn.ru/userfiles/file/xeteleta.pdfIn PDF document text
    • http://rayanchem.com/d/files/famodanumebirexejepela.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/66415662810.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/givopuzulowuj.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/tamulememonogimebezap.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/35184545249.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/63578505454.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613593af2e15f---zuvajagetopenupokelu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sh0t3u2dp9lqcmpq2pfmlpqrat/ripoturawitikijovezadon.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/guxumexazijozuzo.pdfIn PDF document text
    • http://exim5.hu/_user/file/voridopujunaz.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/72946952524.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/vezufivimezirixe.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/29305922733.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7aa16f20---24191226708.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kekubasifeweto.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/xodasejeweritikelofe.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/teposanafevubedumixedato.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/fifopafa.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/68321564507.pdfIn PDF document text
    • http://preiss.at/upload_files/files/78627272459.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319027912e3---jarorofofuranapumazoxalid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+blind+side+in+spanish+full+moviePDF link annotation
    • 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 10836 bytes
SHA-256: 33fe4876bb03857424439d1df6e8c4855f2cbb85762902fd812f29b6848c519e
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 18764 bytes
SHA-256: ea6cb69fe58609054bc5bb57ec37eb0ef4097f4dbca1675c64b7880d812b19be
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1