Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c4095b592ac62f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 22:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba60c62b0a34ba5ee3c09aae44732ab7 SHA-1: d8cb5fe861294391502ef322dbd99ab67316d2ec SHA-256: d3c4095b592ac62f84741e7dde73b65f1d3da9163bd52e2383873143bf8d7dc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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://lidiyageorgieva.com/ckfinder/userfiles/files/lipedisubisuxiputizumiba.pdf In PDF document text
    • https://badeluxe.com/userfiles/files/408482192.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xojapogubiwabamuta.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a2a5d9cd48d5aedd4284fa39d1df43f0/givawinovixewaxomoxem.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wesidamurawatewugasez.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/28757007385.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/83520269865.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/31078981488.pdfIn PDF document text
    • http://intertribo.sk/files/gobexezofusididemuwexor.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xabof.pdfIn PDF document text
    • http://hodori247.com/uploads/files/47374253963.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/46117846686.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/busutifazalegekagelo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140da2d05011---lotevodurul.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/9719488709.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nifalarejuzelumojugi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0rdvh0ii522gaspv7dqk9a74o8/84640004428.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/xifivedimudogadixepo.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/tisezozubozetutimex.pdfIn PDF document text
    • https://ratosatu.com/contents/files/regiberezubukesedu.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/duvufubuselomowugunini.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/as30alco1740pns7tmbstpmf54/vizoviranit.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/44788686115.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/73544608577.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/pitaxetuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=iphone+se+2nd+generation+price+in+bangladeshPDF 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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 18224 bytes
SHA-256: 46ab874893c14ecaa57ada04e0c326730e36d383fe23e731bc6c19086494d45a
font_01_sfnt_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 11004 bytes
SHA-256: 614c1390ebc536209a2de3a3ac53cfc6e609942378d088e5e941f4096d450d71