Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1e970141b05503…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 06:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3ac66c42c5f64561b3c29405895c367 SHA-1: b8df179c49023386a5d568c0f0f2894891ccd93e SHA-256: cd1e970141b0550364730bcf716b383baaf3ce0f73f137c6f6162ebec8f90996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs, while numerous, do not contain executable scripts or VBA, and the document body is unreadable binary data, limiting further analysis of the specific lure.

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://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/89094651740.pdf In PDF document text
    • http://titusauto.hu/kepek/file/jowuvoduritunudezuja.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c3ba798256e4f55e7fc78c4ca634b15d/xiwibejixubuwa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c003a4a63---72519337700.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/39161577404.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/notodeligerog.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613091dd4993f---64148116989.pdfIn PDF document text
    • http://teakdeck.pl/files/file/77722265339.pdfIn PDF document text
    • https://eclearusa.com/images/file/rirukupafogoz.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/zabekaraxowagezegovutijem.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/11984377207.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54107745540.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/lopulawogufarukeximix.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/sekipi.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jurazemokiruzowu.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/73797405638.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/89801030124.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73115049375.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161383a3a3625c---33652710903.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/wunevokedagapebew.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/43641146025.pdfIn PDF document text
    • http://mfahk.com/upload/files/folekasare.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/94321712334.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fevozekoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apps+like+vidmate+for+androidPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 17084 bytes
SHA-256: b388024079b20493ce9781989d6e31706a8aa653d48aef0851ba00dd6ce8c6eb
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 10800 bytes
SHA-256: 1d8a941d2da0563c6af0195dea6f8187de35a59676b52aeb8ea5d3b096ccd41d
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1