Malicious PDF — malware analysis report

Static analysis result for SHA-256 506f44d9a61608d0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 21:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 160194b124b9b4d75b89560f9b565d63 SHA-1: a617021cb8a008e8aa427c66e61a63a025428f61 SHA-256: 506f44d9a61608d0de3cf7bb594e775d08634b651ee3d6b52ff8e264fd44e3ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, being image-heavy with a single text block and containing numerous external links. Heuristics indicate it's an image-only document with an action trigger, typical of a screenshot lure. The embedded URLs, including those hosted on compromised CMS uploads and disposable hosting, suggest an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 68 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 https://chcial.ru/uplcv?utm_term=vlc+download+for+android PDF link annotation
    • https://hyosung-gulf.com/uploads/file/72131480761.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/14222252033.pdfIn PDF document text
    • https://icbacademy.com/upload/files/42003395043.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/20853353212.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/68072530541.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/1337042028.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/34224727339.pdfIn PDF document text
    • https://blgjad.com/upload/files/varogifijoremu.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/13971174513.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/lapuzupunir.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5e95hhnrthf8p891p7vh7mnp53/fegunaxapumonudegukexo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7nrjqil2ifmjcmk7ri834f5nv1/nikajabalibatetas.pdfIn PDF document text
    • https://magerp.org/upload/files/41795443323.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144364594168---zidaduvolef.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/tanokonaliweperixopalu.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/98572169357.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/60566391387.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/josuzevafin.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614caae7995e1---pawuz.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dapowanototixewenonopi.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/wogepoloborezulolapaxurep.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/tefomoligefasapofe.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fesigolusofojefojad.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/tedikoxenodolu.pdfIn PDF document text
    • 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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 14192 bytes
SHA-256: 9ef7c20ac7dcce821e9d3412a0088fbc161dbe0205839b30225c0705309c95a4
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 10124 bytes
SHA-256: 589d82d1babb6779141bdda98e0fe1ec4bed13ec86e3874eebf6d7bb89ab7817

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