Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7649bcf45a3986…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 16:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed1bb7653a7d2a56c15c61b158acc758 SHA-1: 2965a0e331f43128fac492906a15e2b24b2a3d5d SHA-256: 9e7649bcf45a3986fd860a4b62c22fe850720a579e8d3646510692794b5ebded
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing campaigns, containing numerous links to external sites. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The document's structure and embedded links strongly suggest an attempt to redirect users to malicious content or facilitate further compromise.

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 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.
  • 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://asqcert.net/files/files/90683031450.pdf In PDF document text
    • http://aalzkj.love-mrt.com/upload/files/zutepafotom.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613481d80ec8c---34559191248.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pexuxononad.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/xotulebetupezud.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131838ae22a7---37403270186.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/75494407573.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/vapixolewakenuvuwodes.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/232ef8e6201ebf09cc83d54132187a66/88002730747.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/milosiletixen.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/lopozilol.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/73245663753.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/rexiwiretepinote.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/nularadovosinoloz.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/mokegujukipi.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/46674953133.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kajugiwemuretozutox.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/pesukolowekizoriwiteniwu.pdfIn PDF document text
    • https://norservis.cz/files/files/52953538988.pdfIn PDF document text
    • https://j26clean.com/upload/files/neminewa.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/36505535641.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/61143912359.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/7938919980.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/61984717699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=444+angel+meaningPDF 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_off0000b1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C7 9948 bytes
SHA-256: 171bb88f8bb2855ec11d5b6f4d98193bf40db14b4493a4b89d9c9159bbf4516a
font_01_sfnt_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 13952 bytes
SHA-256: 9466b79187b929c83923d13846e5dff3677b9fb50e4fcd15743b57a2f29f8e58
font_02_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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