Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d88ed08d42c69c2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 16:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3de48b997ff913d6ae58327f81c841a3 SHA-1: 9146e88baacaf037ffdc793b4ac97b3c1b2e6484 SHA-256: 0d88ed08d42c69c262b07bcaf0976a3f4710a5449f11e1fceb518fc532e182f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics flagging them as potentially malicious or part of a link farm. One heuristic specifically points to a raw IP address, and another indicates a link to a compromised WordPress upload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://maconlux.lu/userfiles/files/fixulilizubolifilonam.pdf In PDF document text
    • https://laps.pl/userfiles/file/42481977981.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/16612043951.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141598fe56eb---vutojifuvurew.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/88452350979.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/68511935822.pdfIn PDF document text
    • http://nanopena.cz/upload/file/74703924613.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tuzasejerudubita.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/sizazunis.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/didesovovopapijafa.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/52488639222.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613252605485a---wunokikuwafe.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/97272556530.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/14391907035.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2armre1k1r2d4vpu2bqg4c73jq/2652598745.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/lijaporivapukivigek.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/r9o0pk6vninkuot1cuk3b6q9os/kolepefezuxatogubasixiniw.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/76347126812.pdfPDF link annotation
    • https://a2designbg.com/userfiles/file/15566620558.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zojuvegasirifezumirez.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/68573766241.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5e98b206---zewafuzebisumifoz.pdfIn PDF document text
    • https://iword.de/userfiles/file/92979707835.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aba40293a---gulumufodabetudagefunetif.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/29760427564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=online+bengali+book+readingPDF 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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 17480 bytes
SHA-256: aafa9aa0c5fcdf8e71eb64826c77a50b05bed7aa0c5cc87721d24c6965ab58f0
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 10416 bytes
SHA-256: bfdbb50b6a1f704765fc8d7364c7041977032db8e8100c0c0555d055e234edbd

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