Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7e835984259dcf…

MALICIOUS

PDF

90.9 KB Created: 2021-07-01 21:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29f8946f0cdf32f8126db96fc665b6d4 SHA-1: d18a6181cbbce977f6c7ce1604c8511328491e91 SHA-256: 3d7e835984259dcf61badc8e93cc48d1335fb65f247bb7b84a463011c43b54d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in one of the URIs further suggests malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file, likely used as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c878d95b35c---lobidapitonowagafusutaro.pdf In PDF document text
    • http://sanphamhanquocymy.com/uploads/files/milelow.pdfIn PDF document text
    • https://basisnomor.com/contents//files/lojidijefovesolobukedaxud.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d831a09d0b06f688d3f0ce71ba105bda/pofiwurajujagigaxubes.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/buxobuvekite.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/77095060520.pdfIn PDF document text
    • https://examonline.org/examonline/userfiles/file/waxakerupiz.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0650534b1e---lixudimejibuxemiboz.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85c0382c5---gonipuxizifavivusul.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e283faf953---75626469109.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/simuwobozi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/00938c1769676db77cf13bfde85b3052/pekiror.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a402bca88f3---19040589613.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99a606bf09---dekule.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec13d2741---47384873060.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/xaxekupuzifufesuvezunema.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bn0t9niu3t7ltvrldgi42fbnda/55598470848.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1c7b0e3921756965d3568ad8b0020549/buxidosimurukafikobup.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/bewizilivemu.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/20866621784.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/15794495709.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/voridatoxowababugew.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/jerakif.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c60f8aa1c5f---98504403834.pdfPDF link annotation
    • http://laduses.nl/image/file/mogofevugebamegosuvudoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=biggest+meteor+crater+in+the+worldPDF 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_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 10956 bytes
SHA-256: 955dc74f2d058a431b82f6e6e9a76904f7578abe99353d70524bad979b56ba9b
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 18584 bytes
SHA-256: fc03bc47d6c7647e139f69c73114c354063331cd7cbb5462afdaedc43c680db4
font_02_sfnt_off00014458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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