Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd072d1457709d7…

MALICIOUS

PDF

95.0 KB Created: 2021-07-25 14:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3a6d340a97fb4666f246f08d746c9cf SHA-1: 9abafb5d744a0627169b4dcb558aaef34ae5ec12 SHA-256: 5fd072d1457709d73dfb7b33967f58715a2cd5faf3392e673063434319feaf2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute traffic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://rasciindia.com/firetech/ckupload/files/xarusazovituzuziver.pdf In PDF document text
    • http://cmtdental.com/upload/ckimg/files/mixafonanogokad.pdfIn PDF document text
    • https://wittnebel.dk/file/41359947917.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/42315733400.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/tigawoladujed.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/66558530930.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/biwiraguxukidegerapa.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gekonisiwivikejukatenuro.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/lulevabajomumidavuluvok.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f86954786---28271823623.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/waropapurip.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea2b5d774---tewudosunube.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf124f3bc---37312917977.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210710115832.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/25376286779.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa3a6af90b---97884724248.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/8i7vnu55euj0ogr2al52o1hhf6/85662364300.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a1cc48ffcebbdc678f4d34865203217a/nudevukamuvaviv.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/63657692293.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607653e8848d2---22114503423.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a117286f62---67194607135.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/gobasowibugezev.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/wamimuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=plantilla+para+armar+un+prisma+hexagonalPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 19012 bytes
SHA-256: 9d798e35016f7e9df01a5e14c55d7e396e24ca41b0f88f8bba80945bdffe5166
font_01_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16276 bytes
SHA-256: dfc4638d2e007909ffa0f33d53a380638a8b530fb86d4f784fed66edff282ef8
font_02_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15448 10904 bytes
SHA-256: 3c8e7d6baccd20c596d8a5722beb031450dbe0acde5ace6dcbb5c59ef2f68461