Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd29f01567a8eda1…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 10:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4d5a6f5414679a87e01dd2eb69f30ef SHA-1: da1f454f2b9bdf55849c461a28c1847bbaae496c SHA-256: bd29f01567a8eda18224c9e1a0b5368151b62ded2484c5a9ce637bfc9ff6aba7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://futurepoolandspa.com/ckfinder/userfiles/files/53451190522.pdf In PDF document text
    • http://csigikes.hu/admin/fck_upload/file/7204989391.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137981669938---bagobivolitejorikofat.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wolisinafulisojiretarofis.pdfIn PDF document text
    • https://aokman-drive.com/d/files/46260030257.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/49662450128.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/natonaritosotozerog.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/41698320493.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/59466915876.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/52625b4884c6eb51e746cd95da4f9abf/2750216843.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/somuneposotugiwazewe.pdfIn PDF document text
    • http://platcometals.com/images/file/67407416130.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/buxeluluro.pdfIn PDF document text
    • http://tipiland.net/upload/file/wafitedebazi.pdfIn PDF document text
    • http://soles2walk.com/data/file/7315199928.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132407c3f866---xafagowigabejiluzunef.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/zenazagixokosasabora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+set+a+sleep+timer+on+androidPDF 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_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 10632 bytes
SHA-256: 82b6fc5bffb9804f8beff13ba11f0b83783f91b0879d3aadbd76cd80b2acc422
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 17872 bytes
SHA-256: 86ca9dec3390fede4de7312daa06f151dc72f1b4abfbc3cb7da35fb5bd85511e
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1