Malicious PDF — malware analysis report

Static analysis result for SHA-256 7171d22b0c673492…

MALICIOUS

PDF

96.4 KB Created: 2021-07-20 19:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7cc959cd0beb078bbc4f9cf8870a4281 SHA-1: aa14326b1f48d4e781f9d08eedf175bc39848b0b SHA-256: 7171d22b0c67349219692efd4661f19376e4ff2c4af31f221974109de33e7b4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly indicates malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://darshanam.com/ckfinder/userfiles/files/minajobovabexer.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd338575b29---151325788.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90974402071.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xaxoxinobomobowil.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/jewutuda.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/43299372734.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/35921055613.pdfIn PDF document text
    • http://kelvista.lt/images/files/33763825312.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b64406229---68042782572.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bivoqgu9t31r8cjmsp6jlvi8c6/11139140534.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/95512908162.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fe17779c---nesonudezoda.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cdb6a7bf249a03d1fda3b27c04badb91/58554874010.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/tovubujipavujubefifi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9c6b926d87a59012879a23c9c2239d2a/bidagelapuporisen.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c226801d5---91790596552.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/pafomubog.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/36865376627.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/galumo.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/kewagalezuxikujolele.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8b33b4e8---lozanarukuzix.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e19ef45b400a194d72280e159c323884/45122356427.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/2077025121.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e5f3115---xixunoled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=independent+and+dependent+variables+in+quantitative+researchPDF 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_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 17324 bytes
SHA-256: c95495db81b800b869c5e3dc4681915568e6d1e113c71c5456a4df8037af1ba9
font_02_sfnt_off00015b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B50 10892 bytes
SHA-256: fc6433f0c9a91cb955fbfdf87aa74b5a178302085b688ead8db903348462041a

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