Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2656441dcdb35b7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 09:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f5b19905bb2d96433cd8904a24c7d1c SHA-1: 0580648029f85d1e0479338427c5c7192b9ee560 SHA-256: b2656441dcdb35b7cbf6e71c2ab544f45a8666c430edf252737f416f318267d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the file exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bozoklar.org/ckfinder/userfiles/files/40611790035.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161460b3fb5d42---73433428001.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161329aad7533c---tafavodu.pdfIn PDF document text
    • http://bakoca.hu/files/file/dadaz.pdfIn PDF document text
    • http://nessium.net/userfiles/file/zofosumeve.pdfIn PDF document text
    • http://fluffy-chins.com/images/file/lirigusavum.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/30912148206.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/77664356160.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161490f24e8ed6---97293135854.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/84786998245.pdfIn PDF document text
    • http://mrybalko.ru/files/53654572590.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/zozanefitaxipenabarazu.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/kulezifanugepanonipodar.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/pewetutexikenebuf.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/dosunuju.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/51083478887.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/zinup.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/49205840864.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/wapamupikovokakoso.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/47021354345.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/telamawipuwasozokomas.pdfIn PDF document text
    • https://geloracinta.com/contents/files/24639637004.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/77286484923.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/fogabomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+historian+elizabeth+kostova+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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 17908 bytes
SHA-256: 32b35f249dd8a97018122bbcea7231efeaebdc0f515ad7cadbc77ec7fef3e6a3
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 10916 bytes
SHA-256: 18304408bac6c4d9717472c03949111c7664315ff2eeec372cce0b7ec5c7571b
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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