Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2a377d12ce27c3…

MALICIOUS

PDF

67.8 KB Created: 2021-09-17 06:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c14b291c1eeb0105f53b461dd6e4d5d SHA-1: 23a33a06dcd71945c93a46eb865c91ff8713f9bb SHA-256: 5f2a377d12ce27c370c8a8a07d91dce41707bbf8f5eb464b688cc8961b02932c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing an image-based design with a click-outward action to deceive users. The embedded JavaScript stream and numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggest an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely serving as a downloader or redirector for further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hojoairport.com/images/file/vigidavagowubugurer.pdf In PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/najogixedulelozifofiz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fcb920f2c---jowujosokuwitani.pdfIn PDF document text
    • http://dsraxys.com/uploads/51567174007.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/13555590343.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xerekobafadifawivi.pdfIn PDF document text
    • http://lactopad.com/uploads/files/85487480145.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/lazan.pdfIn PDF document text
    • http://health-bridge.in/upload/file/72732839695.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/dexizedubi.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/nobazeserikewadezenon.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/nenobekewamodogol.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/23683165152.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/13674389258.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/zutiwirefinagezejudaditu.pdfIn PDF document text
    • https://invision.buzyhub.com/files/99033346860.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/24370206353.pdfIn PDF document text
    • http://grandfiltr.com/files/file/lazogetaxilebetima.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4afe6f8d7---ganufivijajiso.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/rizivab.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b747e5ab---91802852117.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139871dbf6bd---68686630651.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/65942b2f6026a82eefa771bf6b2be537/23866500638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=aplikasi+download+video+mp4+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_off0000ade9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE9 10760 bytes
SHA-256: 8ba2c8fc76d72dabdb2481c0c16554cc86d5156d42e3e1e13abf78d506c6b72e
font_01_sfnt_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 14204 bytes
SHA-256: 0344d2f807f8d0c8779f52ced26113373b50c3c8ebd85f270aa33535242d3a0e
font_02_sfnt_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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