Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6602be808926895…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 05:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db2bab6b85291c53772ba7edcd5e8272 SHA-1: 453a73a645b8f188ec6ebc21061e4edc099ca3bf SHA-256: a6602be808926895c1057a26f1e8b4d2c77a0e267c7e200cd2f95e12ce8b5771
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on potentially compromised or disposable domains, designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 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.
  • 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://aftckwt.com/uploads/file/99428828093.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/85ae14eedbbe7387b1e4e9baae833145/zixoz.pdfIn PDF document text
    • http://mlead.net/images/e/file/siwujidamo.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2108092153013590804cg26.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/62647444315.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/gunevamajiwifux.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/1019625744.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/zadotedavodopujozedi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6c540efb---satokifijarewelagu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/wixofovuvilo.pdfIn PDF document text
    • http://carbontuning.ru/file/57981501227.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/34379239227.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/73075914038.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/26273765629.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/54853558783.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a83e0532---48095864761.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cf5c48259a214385ebc1ff1b39f60d1b/67453715738.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091e337b9502---tolidobipunolejoduxi.pdfIn PDF document text
    • https://educhina.mn/editor/files/jajiminivovafujixuwiza.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/davuwepefefajiw.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///98174253036.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f163493a0dc---79464993247.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/tapukaxepunukil.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/2776717037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=change+over+toPDF 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_off0000b806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 10180 bytes
SHA-256: 314bbf5236cc564e3d16a3381e24a6669b6897f71d4aaf3f6d0944022498ee64
font_01_sfnt_off0000cecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 13936 bytes
SHA-256: 8203277fc04390f4c3600709a2179e79af6d910f3bb3f85af3252002ca1c65e1
font_02_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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