Malicious PDF — malware analysis report

Static analysis result for SHA-256 420731c535ae8491…

MALICIOUS

PDF

84.5 KB Created: 2021-08-23 15:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d1f5fd73411864035a51133e6b80b80 SHA-1: ba77e7431e475fe0930448cd51d4413cafa81ed2 SHA-256: 420731c535ae84911e4b909bc0bc1981a842765aae7c9ca8bfa3863c55f2b17b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=best+diet+for+hypoglycemia PDF link annotation
    • http://studiocalderini.it/userfiles/files/bonura.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/puxipotibigelez.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610379a9bde1e---88986751665.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcae511014b---40112448828.pdfIn PDF document text
    • http://zenithmetals.com/files/10130268015.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca51bb55816---gorokiwasiwuja.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/wuzajufat.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zuser.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/88094445001.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s51s4cg4fa2ccv5patic7jpuu6/83450434250.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d4912cd3---79397416149.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/mitujexijodamad.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071f886a9dc6---56589988812.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/vufitipelakixowoz.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/14116207772.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad9d3cc33---14261910241.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/wodetelaset.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235b68d261f---jedoropuxurufofotif.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/40592786857.pdfIn PDF document text
    • http://contua.org/userfiles/file/14832701485.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/16588883476.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/fatokiwuzubaromilipef.pdfIn PDF document text
    • 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_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 17312 bytes
SHA-256: e934013d33bf41c2a67058ab60a8924870b814ea53caf6427a4700c166e26b30
font_02_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 11128 bytes
SHA-256: ed8177f89c1441164c0052b68aed66953eb9851dc71947a01578fb9d5a177744

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