Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b3271c687f9a3a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 00:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55bdc2fbc2fce50b9c85948457ffb10f SHA-1: bbed2976d58557bc741c444297f6803b0cac8b03 SHA-256: a0b3271c687f9a3a959acbb6b7aeab43ff7a213ec8ac7f879e1dbe8c0d4240cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers to initiate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://casavacanzesanvito.eu/userfiles/files/63197964360.pdf In PDF document text
    • http://rovitek.com/userfiles/file/mokunijedosaxazijorupoxuj.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/12644329727.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/poxusefakumoxonari.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/11951066217.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/93659399742.pdfIn PDF document text
    • https://mauspro.net/upload/files/30699679812.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f6b71ce6db981885abb8501e53309cfe/solosazute.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/leferotinirezo.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/48719332295.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/gelelujusimajonuxipepemim.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144bdaa4dcce---mikowafetapube.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/43532283131.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/66510630720.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/tovufijawomozajejisu.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/telomuwojuw.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///51165834796.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/jufejitimoxumi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/7512320031.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/77787169593.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b091971f7b4d1e15f15dd9ba6bfd9dbd/42040424737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sword+art+online+wallpaper+hd+androidPDF 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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 10480 bytes
SHA-256: ffc1dfc488e931b9caf210650a80101f369cf34be2f62b0c5488543d05609f39
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 17200 bytes
SHA-256: b6d65e8681a6e16dd626274194b5922c43e4f3b345b880fda0d0feeeb3b7ece6
font_02_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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