Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62d69c0ad5c1eed…

MALICIOUS

PDF

112.1 KB Created: 2021-08-11 02:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1707b8f5efa0494d1ab08e0c84755191 SHA-1: db03cca4b9648575203acfe094ab8403019d5c60 SHA-256: f62d69c0ad5c1eed3398e2a8d569a97d1ed252d4b2493ccc093646bc242e4b8a
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 websites or are part of link farms. Heuristics indicate it's a link farm on disposable hosting and potentially a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hsdinstruments.nl/uploads/files/bodukubutiwux.pdf In PDF document text
    • http://yuha.be/_files/file/46363469261.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/nufiwanovatofodevewimizez.pdfIn PDF document text
    • http://edgecs.net/documents/ripuxonabudugisowosozefej.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb047e9de---30344624882.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/o3f83gvbthuoq07oug244e5ksj/9585873427.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80bad0141---gatuxatasoraguxul.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/godunuwufo.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca344eef88---tulosabeg.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/55027926428.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509889443c---zugikivajavijeme.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6ba72a40---95440649209.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/tinigojopelekaxotug.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/tafasanezeleduvo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34ae23b11baf90f66bbf874a881cbed2/75238006959.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/44518111997.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/sedifigomaga.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/lubaginetikowolejewev.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8163cbb0ca13add236c9e3606d91ebe5/xenutakesafafekiwudop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=libro+cartas+de+amor+de+grandes+hombres+volumen+1+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 11380 bytes
SHA-256: 0b1b90af930c748b57980e9b7ddf4037f3f931e691546e30bbbc9551dbf8a987
font_01_sfnt_off000140ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CA 3016 bytes
SHA-256: 8e37c3568664fdaf261f4d96827b85e998c5c6a16a940afe7e9b029eb2b1c2a8
font_02_sfnt_off00014d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D25 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00016266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16266 21384 bytes
SHA-256: 0d2542bc5df18985b74d3b98d5953904b3aaf8c7aee5ee4159e68581ccd2bbbe
font_04_sfnt_off00019911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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