Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a36a8606233fa4d…

MALICIOUS

PDF

100.0 KB Created: 2021-06-17 14:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 75995056b34dcd19f7cfda146847e4b1 SHA-1: 0e989ed6d6e988ca8d187ae5a6fe48d2a5b70dcd SHA-256: 5a36a8606233fa4d45c3b34f8e2945e05ecaa3eec5f96100858b5e388253d840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9773544ee---53153143748.pdf In PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/76540d23974b282cc43c66787fc0bc73/disegewaperojitalimuzizo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a293dad769---45225368795.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b955d3c7735---zixuna.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c879ecb79---34405010541.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160867755596b5---62106703155.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/43203505130.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/53230827232.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/76734126069.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/36938864674.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27c3da402---laxasuwikejamez.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16077b30f55812---rinitetako.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521101217559642.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bagipiwosuvodegupudevu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/12dcf182fb73f38341d788885c5abf7e/89286693445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=savita+bhabhi+pdf+onlinePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 3744 bytes
SHA-256: f298fc753c8fda36de53fa466665eb8ac506a397f3bfe149a1f4053f196f2ec5
font_01_sfnt_off000141bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BF 5160 bytes
SHA-256: 499c4ea58923e3ee9683ebf8d377153a3d78a86a6922847f3ed580cc0c1da9b1
font_02_sfnt_off00015351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15351 14996 bytes
SHA-256: 09b4c879350d4c29750866caa6bc6b54d6a204ddae8eec0656de76879f81fb45