Malicious PDF — malware analysis report

Static analysis result for SHA-256 980b6cbaf1ac4c4a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19f16b1d5e9e2b628ae911d9e2c6e3a2 SHA-1: 48f3f4983d49eab6d506c370e3c54dcb2117bb72 SHA-256: 980b6cbaf1ac4c4afb158caef3397f848d1b6954a2e0a8ecc8ee6bc3f828d8d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those identified as compromised CMS uploads. This suggests an attempt to lure users to potentially malicious sites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lonniestireandauto.com/nbloom/fckuploads/file/65938205078.pdf In PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/54808543433.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/kidojuzuwedilufirakokop.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/82252768651.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/70104780816.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/bitisujozofapevepufodenav.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/26054691221.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/xamekoxitujowekosabuxo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3748be30b03410e27c111c7f9e08c58c/dunujulafen.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/defegid.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f0eb93a4---32948730977.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614138c7bf3fe---46817316088.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/99380397553.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/duboloz.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/vimolere.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/89954397787.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/nawer.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/52359399867.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a49959be2---48489273584.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/73468892502.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pavabugubopaso.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/42523107358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=yellowstone+season+1+123moviesPDF 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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 17028 bytes
SHA-256: fc89916111b5876e3e135d002a0c3ee4b8160644ee3f4ea8cb243911f4f8f759
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10648 bytes
SHA-256: 70230c2cf17abcba0f3574bd475bdef0b3875fc4c406df785cb7fb49ef192486
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1