Malicious PDF — malware analysis report

Static analysis result for SHA-256 718df32fffa463b8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 16:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dd68dcf6ccfce0a5c14b40c30febc0e SHA-1: b53449e5cb4ceaae16f2d4980eb56318f9cd5115 SHA-256: 718df32fffa463b875a1d87d5c1be90d37d65b21d03bff590f9ed253f50e8fe1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised CMS sites, suggesting a phishing or SEO poisoning campaign. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://apexnepaltravel.com/userfiles/file/91460428817.pdf In PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/nasidesixusejomuwefeni.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/fidifagevusunip.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/79280475295.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///14283745725.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/55179566043.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/555984466.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/74dfb9bbf6bab22db081483ee9fa6c9f/duvofubazawozilezowozosuv.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/7123224364.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/bevanadagavaluzo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pubelemadexojunabodajaz.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/51794317014.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kowafonow.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e941aea3a---66280822244.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/58486443090.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/71248793094.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/bolakokowozaxifesakura.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/sibeledovozijovekuwuwir.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/rupominuvilebajedarexukep.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/89765840445.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/75d953685cdd4812e75218318f319a72/valoduvovogubemim.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/86354645316.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/45330636941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=game+rumah+rumahan+di+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 10340 bytes
SHA-256: 3ee60360198538e8732b356b937aebc90c2426f026f6f20d4f646876f6fe1080
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 17288 bytes
SHA-256: dca11bad683b7b39b920106e0e89082ada356a52af68dfbcfe31935fc502042e
font_03_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 2276 bytes
SHA-256: fed2929c761bf8bcc354e181314606a4fd09e0a773da6928dedf3a34dbbb6d9b

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