Malicious PDF — malware analysis report

Static analysis result for SHA-256 241ae4be366ef755…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 12:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a53042da7933df0493ce0031515eb761 SHA-1: 053a58d83a542d65cce5bf9fdb340873b4dfb0e8 SHA-256: 241ae4be366ef755537236a4d6feb5504a7b442d677a50d6f92070391dfbd593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious content. While no scripts were directly extracted, the nature of the URLs and the detection names point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614173a09a3e0---sufikadenikawi.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb36e70c1---karimutekopenodurunova.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20d018cae---bifigigizolegobik.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614178cac6500---zukigunorumolizafum.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/41233681181.pdfIn PDF document text
    • http://humanlitech.com/files/files/wenuwefijaposufu.pdfIn PDF document text
    • http://cochemical.com/upload/files/xojeremixepavodagulu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/78960715074.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/58426342148.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/89521842974.pdfIn PDF document text
    • http://silver1979.com/upload/file/taxinikemarokisonugap.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/99625818261.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/18534470608.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/99888557255.pdfIn PDF document text
    • https://coluer.ir/documents/file/vilanewitowekawoped.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/56457412286.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_052331.pdfIn PDF document text
    • https://equimat-cheval.fr/file/resesiderupifewuzipab.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://speaklifeiamgreatness.com/files/files/6466881513.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/danojekujananidile.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xemar.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/napijinuzijabawagofe.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/wikefejironul.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/lifeligutumukipupuda.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/deledewesedisezezewafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fb+lite+mod+no+load+apkPDF 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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 10492 bytes
SHA-256: 41322c95a2021822a950a9f764f03ce8fab508933273ace4c3b01f5e5d476950
font_01_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 16032 bytes
SHA-256: 404cab7bbe198af8431cc89b163b35f70111b44f9df00eb4030ba95eaff1ce53
font_02_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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