Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4a976510bae140…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 18:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: effc81c8f61e14b29c4982dadce2e254 SHA-1: 0554a3a6b65e00d74718e6efad7f8a971e630204 SHA-256: 4e4a976510bae140ab031a9287e31a3214e1890ee3b63643dc4a3747bb00feee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely intent to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=bisacodilo+en+el+embarazo+pdf PDF link annotation
    • http://beerskiboot.de/img/upload/file/58345995242.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bufovuwesejujaneta.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/zelefezibitaxavikinu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d882758895f611c27c355d423d57b448/dumavoxarumakifuj.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/60036651024.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/11077636326.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210725_C7367EFFEFDEEBAC.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e43ff498a7c---sudixipamiwuwuja.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dd8f7e06c---6520944787.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/pafosemimulujuzet.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9be475a274cf6a8daa37bef904b398eb/38370875428.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/69805283820.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608105727e955---64903848104.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m30ieqvmb3gnroklmjv2em6rn0/remevuf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ug6n1ho62f8tprqasn783lm20/loxoxodegelufanaworako.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/sibitolewarifulefinudixij.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4508e6f3a---gibefejapimufa.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0atdc5lp0ubpinjt5h2prk7qi1/43980998918.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/ravimuserelitewikosulige.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/1902160062.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/30257944940.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f4a36c3f8cb03ca789fb269bd50f5cf3/lajuvem.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/56519216212.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_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 18440 bytes
SHA-256: 49a2888d7a7a5a59aad010be885e843bafab6c9bacd1dbdc4655e39d06293964
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 10936 bytes
SHA-256: cd84a6eecd6b696a7e846b5f60afb77bdeb9db1f97102c08622ee829d047d511

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