Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a4abd0adcd1ef0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 10:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3299e6599707dd91147e43e0133b497 SHA-1: 5fde809bbc818972756d6f31742255a6d3f447ee SHA-256: 08a4abd0adcd1ef0d9e73072c66972bd7e07d9e9ae1ecc54d5385946167c5e05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, further supports a phishing or malicious redirection attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.alapan.org/fckimages/file/gadugilopefipewirubotij.pdf In PDF document text
    • http://creatinglifeoptions.com/userfiles/files/88423547765.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da95f326292f77000aae09374895b839/70220279276.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/99f54aee199caeb8f864ffb3ac1f626d/99636543490.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/64375656702.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/65764417967.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/45130232514.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/kufugunoxipejaxeguvi.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/49192901746.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/rozotevivi.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/42550511690.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/fipaborima.pdfIn PDF document text
    • http://rentaruedas.com/files/others/38019699110.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/sijomaniwejutoxovob.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/99178873782.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/58437528546.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gtp6fgu1mmcde9b1kou4b7p6si/nigibota.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/89783775144.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2e55881e---73398144321.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/mosotepane.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/mapiwijiwakiraguj.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/sudumazogeso.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6e4e336f---polumaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=powerdirector+no+watermark+apk+free+download+for+androidPDF 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_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 18108 bytes
SHA-256: a8301ddaf08886456d9db4f4f6144ecafff2b0b0c59eb7dd0e94428e59078fd3
font_02_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10792 bytes
SHA-256: b3bb720efd196d1b239f3355739c276c4c184160122d82bda7c8e792fc7412cb