Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4ebb67e6c792f9…

MALICIOUS

PDF

102.9 KB Created: 2021-10-31 14:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1510164653134f198c3e0b8997ba201 SHA-1: 964fc8c839bce0c9a82a3c4b364b7b341382ad4b SHA-256: dd4ebb67e6c792f9014611cbd4a4d172e5068341356810429eeeeec02e8f3031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a phishing or SEO spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=thermodynamics+an+engineering+approach+7th+edition+solution+manual+pdf+free+download PDF link annotation
    • https://ventsistem-bg.com/userfiles/file/fenenopupenizokunifisa.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/zonilosafuteremudireminev.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/sesitabij.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/3747715609.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tpgbvolsuqm0ngnje52n59kgs0/71070368476.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jimafekilabujuvonofijige.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161778df78b9f2---33317492252.pdfIn PDF document text
    • https://kimcert.org/E/file/tusan.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/rosinadokasa.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/43429732595.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/40955818281.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16168fa97a0c00---lazijopakibij.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/68059131161.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/56050260920.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/sakuvojo.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/85737748323.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ketalide.pdfIn PDF document text
    • http://isvpro.com/custom/files/99352611275.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16165be64b1af8---filijogerufepetakiwime.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/reduvusujub.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/biwagebamevasilaxalap.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/rudalilugikodade.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/3609497075.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/fetifuzosukoxujodezokek.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/43132955940.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/jawujodasudifor.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_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 19368 bytes
SHA-256: e2cca6bceeec0ef49c5166cd9cc8963dd6dfb3246085e367542dd57e2a72f079
font_01_sfnt_off00015a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A4 11380 bytes
SHA-256: b87f5d23f1095da55bd9d8a1c78fc2da4d8954d1d0147616529533de414c7e1c

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