Malicious PDF — malware analysis report

Static analysis result for SHA-256 23db1a8a0d3ec08f…

MALICIOUS

PDF

105.2 KB Created: 2021-09-02 10:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b5056897f918d0fe77f621b23bd67f7 SHA-1: 8b7e11930312fa12c44168ac1f826ab22a95631d SHA-256: 23db1a8a0d3ec08f7bd2719283acd61877105fb2636da36e515007f914b9b46b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://russkiivopros.com/images/FCKeditor/file/gelilomusuvutudade.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160736f981d6c7---sududotugum.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4j362nfncsh0n6ndibb94s5sj5/36857478154.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160995317c2032---kovilojulodin.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/56343399610.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6hhi993aus6j5q1hn23gopjk0k/73459560838.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/61771298047.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/xagix.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/watibukasedi.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/fevazowodivigisak.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/9347849072.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/86972671198.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/dqpfi72t39mdonl4ncpqmlmkv3/bolibopuvubetebap.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609457e40eedc---19441654232.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644a14b96b---movogan.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/fizupasufemumukiwam.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/51011287887.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/90639033139.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/12547501262.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/lasafoduvakumaxox.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/9d66f833f78b5697863647a44cf3f74e/ginatabavoxaga.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5804ea58---dijume.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab79493a---pavulagibimup.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/98991721483.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/416c0b8936bd0b226a5bb835908dd5bf/71908414865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pace+out+in+tagalogPDF 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_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 21892 bytes
SHA-256: 465306d55fcc31ced701fa431edd4e89119d23d214f4aedb989f1e757036cd57
font_01_sfnt_off00016722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F39 10236 bytes
SHA-256: 49b5ee10bb6d806582138bd3bcc136cf010a9f1abb6dc61e39a4645bfae2ec4d

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