Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b9b7bc6712980c…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 00:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e26f71cbdbcb940507938a2f4ebeb65f SHA-1: 3c5ab73faeecead36c313fe43178efa9e5a64336 SHA-256: 95b9b7bc6712980c5de34607f8e0a01d274a3c9759c2ca217cb018ec399b73c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33172e73c---49234122405.pdf
    • http://mhinflatable.com/upload/file/movaludixuluvepu.pdf
    • http://rungrawin-itt.com/userfiles/files/mobabex.pdf
    • http://indagosrl.it/userfiles/files/tujisubivuvu.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/ninuvonimalusob.pdf
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/tufopojak.pdf
    • http://agro-vostok.ru/userfiles/file/bakojigipupifekotoveluluf.pdf
    • http://potentialdesign.cn/userfiles/file/1630802328.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/40151413730.pdf
    • http://eventologia.com/userfiles/files/bubekanowufamu.pdf
    • https://vinadesigndanang.vn/uploads/image/files/22606035061.pdf
    • https://taxforce.nl/userfiles/files/vibazedabewogunefen.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/39289363429.pdf
    • http://nguyenthaotech.com/upload/files/gagofetuwawapotuzirekibo.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613342ecb68bd---nemimegep.pdf
    • http://aldobini.it/userfiles/files/83207826115.pdf
    • http://usarsenal.it/userfiles/files/valagusewupu.pdf
    • http://deleersnijder-bocaege.be/images/file/nirewaxirobukegexeranip.pdf
    • http://syarmarka.ru/userfiles/files/41183433114.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/34685118017.pdf
    • http://studiocinti.eu/userfiles/files/14206868153.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/lusebisuf.pdf
    • http://sushinamu.com/uploads/files/90159150338.pdf
    • https://securitydm.eu/slicice/file/vijogudojegox.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210906_D7C05279910D3EF4.pdf
    • http://garankuccu.com/upload/fckimagesfile/a024ae81a1e6704dae83f9a51efca8c1.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c8e31990---domive.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=drag+race+uk+free+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 16792 bytes
font_01_sfnt_off0000d32a.bin
0469dd34972a6220bc3b83f568e52b9b16a244bc25251121f041effa56b6e98c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 17024 bytes
font_02_sfnt_off0000feff.bin
a84825072e7597f3490e335bf11f1dcb49831f3df727673aad67ba05e1e04d7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 10436 bytes