Malicious PDF — malware analysis report

Static analysis result for SHA-256 e681696a8af44101…

MALICIOUS

PDF

84.9 KB Created: 2021-10-07 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5ec16dbdd79e9fc802ff3c3ebb90a8b SHA-1: fb52954661bb4be5aad85eb0833d6442efb0aa2a SHA-256: e681696a8af44101d898dbe01d943be5f4393c51286a93a6af24b5d4fa5242b5
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or unknown websites, some hosted on disposable domains. This suggests a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://traslochimontalto.it/userfiles/files/29612930234.pdf In PDF document text
    • http://orenprom.com/img/account/file/pojetajolabajapiwume.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/41541996291.pdfIn PDF document text
    • https://kimansion.com/uploads/file/4611546721.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/32157056809.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/94441488384.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210916221025501180iwwt9t.pdfIn PDF document text
    • http://hkwwta.org/userfiles/degugafirirenebi.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/figowizusebobenek.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16142941d22db4---dezibemepexe.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/15956333682.pdfIn PDF document text
    • http://duef.ru/public/file/94256623171.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/71725053140.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/90748853076.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/4806885298.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/74539902952.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/60994372987.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142014bafda8---12312998725.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/2288865508.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/25270132500.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/gogovenigule.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c88e1367a---61119942262.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/46321693074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=managerial+economics+applied+problems+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_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 10980 bytes
SHA-256: 04aff4afb11a4ba8109e0dca4fcada7b41cb01e40525404e0a14b8add4157d38
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 18764 bytes
SHA-256: 1f9355cb147fc365fda8b1a91c34b78412708eabfa09d4d9e5abcc1993215132
font_02_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1