Malicious PDF — malware analysis report

Static analysis result for SHA-256 31905e01e44c5d5d…

MALICIOUS

PDF

95.5 KB Created: 2021-10-21 16:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7c056fcbe5da6c012e5ad2baad864a46 SHA-1: 1562455f947d76425ec1075cae9afd8c60f43980 SHA-256: 31905e01e44c5d5d9cbcb7b993ae4af9200cf621ec2ca1976997fd435d4ea3bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains multiple links to external sites, some hosted on compromised CMS platforms and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://iwayman.com/uploadfiles/file/211020125325962056wzpykh.pdf In PDF document text
    • http://cristal-in.fr/userfiles/file/92115844837.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/98686314927.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/rogunafilepiresogofanipev.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/limafagupevekonejogo.pdfPDF link annotation
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/rutagaxejerenoku.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xarepovuw.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/ludeteg.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/zujufugupozovaroxeje.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/dixagojokakefufasevi.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210910_052615295AF59133.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/dipevuronapukefonotis.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xowobimudovesinegixo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/772f5ad6290eb03854fca818ab1a2a2b/48049344873.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/sokefurasuvedijubukelevep.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kajatemixe.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/vaguxapopogidi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/949890cabdeebd2766bf63e7651f74c9/79863734313.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/viviboxuxuliwitalugezujo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615b4698361e4---84193657913.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/4697468308.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/julekeziripokorusibi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=addition+rule+of+probability+worksheet+answersPDF 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_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 20772 bytes
SHA-256: 77b9e81316a3bec261a863f24b699c16ad45fe0046c4c8c217b49fc049c9fc04
font_01_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 11108 bytes
SHA-256: 81a1fd3815060a7089135fa2e72b5133a8ad2f8a4935e34fd0f835b79c579ccd
font_02_sfnt_off000157be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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