Malicious PDF — malware analysis report

Static analysis result for SHA-256 4562a641c641b887…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 21:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e7067b7c9530a75da31b9a2ed24634f SHA-1: 76411548167bb3b35f63a1c88f3f944597514ba6 SHA-256: 4562a641c641b887ecd60262cc7a8eb205a462c4ea684bef8a8daf4f4c9e2679
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The presence of a 'download button' heuristic further suggests a user-interaction lure. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://redondoclassicburger.com/uploads/files/wokem.pdf In PDF document text
    • http://aliceinformaticasrl.com/user/pages/lexate.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/vowuwumaluseg.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8a3efa301fc89dad16a02a6163bfb7da/xeboziroxamipam.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/witugap.pdfIn PDF document text
    • https://huanghecables.com/d/files/vevufage.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tisutijewa.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/getije.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f68b072d---rumuzalajekis.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/77560223907.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/pabikadorivuruzuvanoru.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/81c57a9f1158d4384a855aa0309b3aaa/35622042088.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/74995688786.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/98443359261.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16070a71f258e3---29344605436.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lelexakegokizodobuguj.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4820f0c4---44440936993.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0abf03f3ae81b35f774fc05c2e553bc9/wiluvafugemozawor.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/73991968550.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/beluxumo.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/bexoliwetiraful.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/97c317fe65fb901c83a9116461a64cc7/5054016072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=convert+email+to+pdf+iphonePDF 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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 10692 bytes
SHA-256: 46a868b9a16520737bc882da7eaf0169132d3edd67b88110f04952b57b45f17b
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 18012 bytes
SHA-256: 2ddc74de4e4fde26c8bd102c7f7e520f6b94fd2d7045aa7cda0bc879f127d2bb
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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