Malicious PDF — malware analysis report

Static analysis result for SHA-256 8197e1b919dc4ad0…

MALICIOUS

PDF

95.5 KB Created: 2021-06-26 00:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb70b5cd5ea28e5ced558293c342db2d SHA-1: 50a74e9f9600a5dea942dca4c8f9b4b35d4e89eb SHA-256: 8197e1b919dc4ad0eb481cdf2af28cea5deb8686b58583603d83efe233a201f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=wells+fargo+interview+questions+and+answers+teller
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a4324fb0---18356446135.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ugnphe2vg3k882o9cvqcg69saj/fitesaforib.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/608a2af067f752b4f97834b8ecc393e1/zijosibijefobezivitir.pdf
    • https://tedvandergulik.nl/userimages/file/pizowanawimejuwodefosi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6023ed4a79---67947994730.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc82bea347---wixes.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094728c46ae1---79970872194.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818ff847e77---5418586998.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4db49755---fisipepa.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/22d364b8d8b9d5a60b1a9854aa15d568/61387382975.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b7fbfe44---71894731712.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072779ab36b7---femavofobenejedako.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kmjqvhb08902jcahejjplg7m26/42592605533.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dacc9cc3ff---zefexekinemuvativexejeno.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae4780f2---gijogitize.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160af4875af3ce---gopaza.pdf
    • https://bistakalikotenetwork.com/userfiles/file/tujofilatotanuwaziwal.pdf
    • http://placc.info/up_image/vurugujidoninese.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9f0c9fdf---lifetijolexujulevaw.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8e9m81j74r5j0hp6cs7h9hah3f/52731370661.pdf
    • http://sobsai.com/ckfinder/userfiles/files/41430089699.pdf
    • http://dui-antidote.com/images/userfiles/file/51864937622.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/97dde9bf75e23b1e325275e4a16b16bb/kulaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f3c.bin
0edaa450ec2d5b40802c2c9fd5ae7c97c20d68e3c507ed86aaca8cc07e247f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 18632 bytes
font_01_sfnt_off00013f61.bin
80148bf94ae00000111c3d6c6ce207aff9e4464cd6538a60e0cbdb90b96f9348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 10920 bytes
font_02_sfnt_off00015855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15855 16792 bytes

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