Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b84e4a33191b379…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 19:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a590611739a0a7c8007497b3c1cc34a SHA-1: 6d796e1fdfa9139113375db24483908fabab683c SHA-256: 1b84e4a33191b37922155b83037e603a3d074516d7c27df35ad041847679ff90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for embedded JavaScript or other exploits to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://backupcenters.com/userfiles/file/zizezosidekix.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca495470d8---734994158.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/61009623275.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609496230832f---4992934778.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/22698896019.pdfIn PDF document text
    • http://huntland.hu/upload/file/89546413112.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/56919441823.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d0ee6784c65f0f5be14e48b8a2361015/ziwuburoxexegezore.pdfIn PDF document text
    • http://yuha.be/_files/file/dexojevilijepevid.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lizegabax.pdfIn PDF document text
    • https://areicon.com/images/file/19678153604.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9d8886bd3cac7c0e202b2a61812b108a/jufezetekedubodadina.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/zafusogojogapukuzogus.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608470631fb2e---filugudanuwaret.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe947c6f9a---81864872374.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe6c2a5e9---95653719233.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8f77946f076a6a345226d350086a3599/likuse.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/8751013859.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ccb7587d---peninerogena.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/s4fp26b0rrc7gk9l8b7fcmeduq/95039976281.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/44cd12c2e624a696fa829b0686e1029f/73548221451.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/46205791608.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/zagukew.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba189615aab---tutaguribotilemuvujipiza.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e595697f---44613033238.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i9k8r3p20ncgleh8be2do08lj9/xuseve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=finger+cramps+and+lockingPDF 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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 17056 bytes
SHA-256: 672ccfc173b37c305e44d387f2dadc22198fb6abd591d6d6e1b05c7458122e1c
font_02_sfnt_off00013452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 10828 bytes
SHA-256: 1015e93ffd886479b767a1bf277b04837513428c4289fad809e5f8ed2ed34db7