Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86ea611c510ccd6…

MALICIOUS

PDF

90.4 KB Created: 2021-07-09 00:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1a91274f4e8a97083111a5f752f7ce86 SHA-1: 01db339f01e6153b2bff714a067499dad757d20c SHA-256: d86ea611c510ccd6ac86d5b8aeeb87b84201c1906dad863136577c518e8beca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://tyko.pl/userfiles/file/figalugirema.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514105101411620.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dcd43eae9---tejab.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/sibapowatebatedanuforiral.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/21784550066.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/13404138070.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24d3409d1---92408226416.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/lorewotifokabujupa.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e7b19bd367031fd1acd341d610c7f306/liveketodasirideb.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ifofgcavc0rvc1h6etha7rbm7f/sibixunol.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/83405996498.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a1gsam4m4khcp10q3u2ik4cbj7/28223566960.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1tpcrr09uhsgb44p749mma1k23/45602935734.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb7d0f36---xafugubinibabal.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kjjbieoenn7jchtu3vgdc1dhml/dupudikufatizuwiriz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16087e11991c52---75973979482.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160701c00e0996---xaxizosamulipubifebemiku.pdfIn PDF document text
    • http://rld-carbon.ru/file/zulasegokujizebolorevi.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/suvemizaxusuganiperejam.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0gg8qba41rko7ckrufqgjplp2/5168803012.pdfIn PDF document text
    • https://p87.hu/files/60260537619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gsm+in+wireless+communicationPDF 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_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16652 bytes
SHA-256: 00b685e90917b0a58cde484a6797c27f98cb42573bcb588e29454dd83cab18db
font_01_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14453 10616 bytes
SHA-256: 1fa86ea38e1e0e277eac4ec207654427db11e987217b7c606879c4b3c1563e18

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