Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b83a605464c161d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 17:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cff4137c0a3107ef6bd37cf43dd9f1e SHA-1: fbd29ef9ed4b480d048e226d0ffc8289b64c6dcc SHA-256: 5b83a605464c161d7bca0c3367da08a0f20e68a569ee28b036c8edb5510568c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating it functions as a link farm. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7beee7bcf---40965048950.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7c2d9f2e---pulufaguleradimojajokem.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cf66ca08---56581547676.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d235103baaa32b3a94fd9f2948e9a850/womewegedumoraluloxagavaz.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/pipozat.pdfIn PDF document text
    • http://dogable.de/userfiles/file/99000954700.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f439164d---surufafisenopi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fenodesogefufutibul.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ab134fb8344569b7b4302565eaa24a25/98178263444.pdfIn PDF document text
    • http://cortabellanews.com/userimages/47580156223.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf3622814---24380260964.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/saxelaferuvamowaxul.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f7a52b6b---vexarerikuwisasopali.pdfIn PDF document text
    • https://ibextrail.com/editor-images/savojukiget.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/33f15e3232aeb70d6f174aa9afe91b71/94451740933.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/56871241790.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/30841333432.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/de2756cbaf7906df887d96a023f58edf/46150165283.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/00add847fb497bcddbc958471c2c3120/73785305157.pdfIn PDF document text
    • http://ed-union05.ru/files/file/38709163016.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/37273677419.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/16616955732.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/21893614322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=oster+juice+extractor+manualPDF 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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 10748 bytes
SHA-256: 853295965e22c0a3d7b2f2e8ef5380104fdafcf5df0a2f954a7cc9e6f6ebf654
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 19184 bytes
SHA-256: 03622c49262a49cbfed2af97fe7c2867e063eb9f60ce48cd6579260b0f0cdb4e

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