Malicious PDF — malware analysis report

Static analysis result for SHA-256 e601a7ef8e9effd6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 00:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ca3e370732a56421960c8c94fe6b035 SHA-1: ac8a98eea6e5d107b63ecb8851d863a03b177a1c SHA-256: e601a7ef8e9effd6d7dd4829b5101470e0db798ebf71c139705d8dabbc9507c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the linked URLs. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://csc-0898.com/userfiles/file/20210909222738_8epwt8.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25a2fa8010ca5e75529ba114e7d559bb/18399858180.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905044502217708.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338b00db869---8174904898.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/valukufavisuvewo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161329297a7310---50737894904.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/zotozasevi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wogoni.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/sekoxaniridexujivow.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/8419292598.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4b50b93e2e14be1c8ede548d0816aafe/bunetogobipuxaritopud.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xutonijoxikiforiwuxikedot.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69721243329.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/54909986830.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/getomiridimigutiwidoxajup.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/xagederedodisida.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/guxazu.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/30928446434.pdfIn PDF document text
    • https://2winit.com/Files/files/87252682862.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/26cab026f084be019ccd4a9d2cce9046/38242871496.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/43162667293.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109020614378025.pdfIn PDF document text
    • https://12shio1.com/contents/files/ditipifunanote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+9+emulator+pcPDF 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_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 10756 bytes
SHA-256: 9ab75c5925f5d4a5037492bebe8d0cebbdc8fbab2f21f527bff25293a3c0986d
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 16784 bytes
SHA-256: 6aecb1762a394a819cf0e4e927ee3df6fbc4704848a899eb2a88a4346f15371d
font_02_sfnt_off00012fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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