Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60a8b8659b42309…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 21:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93d6d2328df77119e4183aa9f9e3c9e7 SHA-1: ae83607e6720c71e99c1bd4e5a57d61704790ab2 SHA-256: a60a8b8659b423092c14e137ad61de9ecd6fdd63628c8da8c830b46708ab7abd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting further PDF files. The presence of multiple 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirms this behavior. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for JavaScript execution or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ebd42dd3---88357351937.pdf In PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zubesogatagajirolap.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/eba4ec9a1ece1e1cb4b77c2a416999b8/55540624551.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/66742263966.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9dbc0baa9d1ce8b8d407a8b58ba2c306/jiditadamigi.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/583077b0dfa16729aca290d619b260ed/josefuwodak.pdfIn PDF document text
    • https://geniodelweb.com/file/wogalatax.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/27306170658.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tesudenuwuwofanajetegopif.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/27614190932.pdfIn PDF document text
    • http://indel.sk/userfiles/file/7316726095.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/62781726166.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/finukik.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/geximesotopijebekelinexub.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad2f60170---zozevaso.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160856f38cb5c4---kotujimukobumifizu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/dugiwujone.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2ae39edf---22953474771.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mmgcn514d9edo3qgum0lt8e06a/vofapajinazeripunovunogen.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a0c8ba77ae0b9108c650855bb9f6f9aa/78996958650.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7852f1b4---87453668144.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/vuwurukam.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/mejes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=categorical+variables+clusteringPDF 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_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10740 bytes
SHA-256: 8f98487e926ceb724049cb0b747edea1240037ead36f4a672750255730095b73
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 18680 bytes
SHA-256: 24da56c7fdb65ea42cd2e0af309096b5dabfed840ab7c5c7c49c38a5df3c9703

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