Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a07875ca5b87f3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 06:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7cf57875b292d6c4858ffd5a367cd1d SHA-1: 04d568b778ca9484e08b1db3f04e3baea4fb1eac SHA-256: 22a07875ca5b87f366eea32dbd0a6883d82ab268a9f1e5e290e91026831d35c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to a phishing campaign leveraging a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://airtelco.com/data/users/_/email/files/61137738374.pdf In PDF document text
    • https://k-newsletter.com/ckupload/files/2071246267.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/65555724035.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df66c1d9d---52005482719.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88909684d---bagofifajatepuxukatifabid.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/wulumosujexuzumodibowoje.pdfIn PDF document text
    • http://flexicourse.cz/res/file/93622188916.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dvrnkcbj7jsghjqd5pfe9l93ff/23325363342.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6084fc40---resug.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ecae2856d4c6835a784e02a4b4bb6e76/98347228912.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/50349510642.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/fidivopuludozajaruwof.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4han9a23apegmjckd762e5skl2/pezuvomimodisizedip.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/76aff43253bb69ed80285725ef671c7b/gozibinudire.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lipobofobozuziv.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/pabogakoti.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/s79l8qj0te1pahgaud1qrpf34l/nesol.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161093dcda7e89---gujaxu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2eadeb4728---lebotamugejorapalasug.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210906100330.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210816105243.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d904e0229b2---lololejaf.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf7803415---92082919335.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/75650372246.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160878d2a758be---33838960214.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f8409b23---veruzapuzuwe.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/68b5370b0d5efb2e8bc5a6da68ec1a9c/68329333043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bombay+prevention+of+gambling+act+pdfPDF 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_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 18988 bytes
SHA-256: e563f7bafb6820e4295737cd791a9c7beaac364e08a7b750ca911c4c8f1f6f56
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 11168 bytes
SHA-256: 7b6a294a56208a7133ed7d82539b7985f42f7d48cb390854e0a9e69c06fcc4ae
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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