Malicious PDF — malware analysis report

Static analysis result for SHA-256 541bb13f14b46998…

MALICIOUS

PDF

91.9 KB Created: 2021-07-24 08:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1553fdb35d11b6cf63e2bedb1c2fdfe1 SHA-1: 2b4e1211a3ee51563fa0234ffb38fc52363d763a SHA-256: 541bb13f14b46998f948659f411f8ad63080b2257356b3703f4455c31f8aab7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for other PDFs. Heuristics indicate this is a link farm designed to manipulate search engine results or lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/00516e0c946b25ed6fea4685f685149f/47438267898.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cc526a837---66734273029.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969aeb1c8f9---nubupobaboka.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kapabufewi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3a6349b0607dd600b860a19ba39667b9/pujejodolomezezosun.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/18917947401.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/70495542483.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/5208559508.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106281050466349.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/lunonaronukezibiral.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a26ff6125e619690fbb66213e9fbd0bf/nitivugonibudemuvubofim.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zuzugazirevekud.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/66961115707.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ca5hvob5qrm3onovmri119gjs0/larodulu.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/datozik.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ccf4a4f52---nazifomuxurefalogem.pdfIn PDF document text
    • http://dgjst.com/upfile/file/rowir.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/62684804178.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/26341088881.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75bb41d4e---raxenajor.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c282b1a490---kaxisabegat.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ajpjlvlehso6tajl7la8mfmvi6/55162943976.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ea42a10fbda18bce3de836f659b0b343/vobexolaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=whirlpool+duet+washer+control+locked+light+blinkingPDF 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_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 11204 bytes
SHA-256: 8cc4b28b796e580e911c798209e1d098ff9ea2c631d62dfa8f2386764f4bfffe
font_02_sfnt_off00013614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13614 17280 bytes
SHA-256: d907a5d1f512c816914a4682e64493d4ccd27e872a3a3ea717ca6f8331a975c6

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