Malicious PDF — malware analysis report

Static analysis result for SHA-256 359c86b800f3d126…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 07:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dacdfebe7604663206d8f453196d0961 SHA-1: c462c686163e884ce5eb59ee515eaa755bf85f58 SHA-256: 359c86b800f3d126685dba5b31f4966d8b9af57f2d552e25eb3b64a5de9d0600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b7116231---gefofiwanapebaviwibe.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/18814983289.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/lowusidurave.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/vufovodorufeporivopis.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/45606743157.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca74a19ee5---90878214362.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c708f32da23---zidanuxukixidukiji.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984c3dcf639---ruzovumutovexavurifodewun.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/kejovus.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/86120878413.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/10095249929.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/bbab531c7ae921358a853c1fe5691e42/66167888333.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2a49241e---ruwamaf.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jakugipisudusupib.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/55sv59vph8jimh3lih5m7jb9go/52655419661.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2bd1d6934f77d2fad85492d93f1c6416/43882898697.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/tujipunasunaloma.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/32325768608.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/26149336040.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/famedazofizezisotudexur.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pegig.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8cfcf3972a813c9404e2cbf051f3969a/pilivu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/90349675217.pdfIn PDF document text
    • https://sanidom.pl/img/file/84177804293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=can+i+convert+a+word+doc+to+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_off0000c2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 10584 bytes
SHA-256: 63c578a81d371836297e6159dc7be28284553955341f34571886b311d5c73e08
font_02_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 17840 bytes
SHA-256: 90e8f81ba97030933301f4afe9e9d4f09451cd482286b14db5d67cd99e407f13

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