Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c0e809f7b559bd…

MALICIOUS

PDF

70.5 KB Created: 2021-09-14 04:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a179634ce24897d3435ff6fd8ede26be SHA-1: b38201e9f95ee086bed403a72b2159e27be6171b SHA-256: d0c0e809f7b559bd060379aab7f742d44e2d8e818f8d919f40d919dcd98ee184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for distribution. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The overall goal appears to be directing users to malicious content, likely phishing or malware, making it a potential spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://szakkepzosiklos.hu/upload/file/beledesurapinagole.pdf In PDF document text
    • https://birsamundapark.in/userfiles/files/molix.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/31596314453.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/98250872078.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33f9b155e---tazajexiluk.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/remilikegisud.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/346539055613c5619e0b33.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/83266439095.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/kipojemej.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/daruzafepapew.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f947a8844e67a93dac2f49f9f16609e5/dowipebib.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f791ca34bb---84150161066.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/53878950622.pdfIn PDF document text
    • http://rrarental.org/upload/file/35400850410.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/jizopanidud.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/47205331194.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/ravikaz.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021992128378157.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/24662419156.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c408206a22---3700435057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+gold+zipPDF 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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 15716 bytes
SHA-256: 9c6078622b8f7df590280b3b8ba45cc3fadcfa52c879495f152f27eedbf745db
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10360 bytes
SHA-256: 7ebd34ca36336c03e6d656c32254d78f3357a6d39f1cba1a6f647f59480c8900
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1