Malicious PDF — malware analysis report

Static analysis result for SHA-256 306e4cf48c6480e3…

MALICIOUS

PDF

116.9 KB Created: 2021-07-31 04:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9952decd166fecdd4ac8dccdd3c692a SHA-1: 7cbac716e670c04eec7686f67419c1f548105495 SHA-256: 306e4cf48c6480e34c35f20525cd5e94ec2104f9f26720b272ad08d7bf09e3fc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised websites and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7e1f3da67591f0b6b77311b5d7b4720a/ramoz.pdf In PDF document text
    • http://x-site.by/upload/editor/files/93616530251.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08612c80d4---samunor.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062820440986.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08f2eea1---6064930882.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/70412853320.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/69415953446.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/69967956511.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/32523632415.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/pefawiduwaf.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a37eb7118---vipefakabikogurudidunowu.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/98503638707.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/febupamifoviwizimu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161027bc28d64e---medolamumiz.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/16584524094.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/sanaxomudovon.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abd17fcaf---wewelewigewadugeka.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160778fd0624cc---jadulalanonejol.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105260715565399.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/2296459508.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f8212926---46278939462.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a726hhucg0j9kedl9poj33m4e1/57177399292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nypd+banned+substance+list+pdfPDF 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_off0001649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1649F 10724 bytes
SHA-256: 92641a96707eb997ccc8f2a303f15a15aada6b59e953f5218c621ddc084307d2
font_01_sfnt_off00017d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D29 18188 bytes
SHA-256: e15586930ca684d7d1eee846a84155420396425c9e9841a2aa98653911f4c8d7
font_02_sfnt_off0001ad3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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