Malicious PDF — malware analysis report

Static analysis result for SHA-256 31753631fd986cf1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 04:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ec1886616bbb8bf3f030c524b6d2fd6 SHA-1: 0f164f092092999e318de8a7abb1b504c1f24c75 SHA-256: 31753631fd986cf15e997c1e62f5e809b06af32e17f9926fbe8887bde7b49382
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://bortran.com/upload/image/file/20210802082401.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/ronenim.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jolomadirinonexo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872e8b50563---bezixenezukewanufevumef.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509224356433.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/69355340385.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084024cd1842---71111919237.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/juwiberanunululipipofaro.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904fb91e470---75650206494.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/6844255402.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/rifujelosebe.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/59092728704.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/55658924949.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c817c1ef9b---23801154421.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210630_E6FE77EAA91952B9.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lufomiwevikibugu.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/94104301238.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/03dba64bdd95d59d6060e01807e3f857/61417863598.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/47249235086.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/42372679587.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d48bf1806---wifoxadifuloso.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c3bc08e90c1bdc6c8b363828d4943156/69288589670.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/50996431913.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/salawexaparoniwik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=espresso+machine+manual+krupsPDF 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_off0000c3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 20968 bytes
SHA-256: 7b388df0bf38410d07e50b66f53d90de9605487da199f8793af26e7b41c65d38
font_02_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 10716 bytes
SHA-256: a24e8b8e3651d245f1cabcb5dfb4e79e869a88affd8713b9094f197dcbd9a187

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