Malicious PDF — malware analysis report

Static analysis result for SHA-256 709f22c1758af06d…

MALICIOUS

PDF

103.1 KB Created: 2021-06-25 18:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dca9227ad66acfdf6cf80d7438afb8ad SHA-1: df0a546f5c2fa34f9f7f2512ed3fe9b7b1b31328 SHA-256: 709f22c1758af06d2d9f82a6cc90860de16db48e547771250d85aed02e9a6a0f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://irlanc.ru/uplcv?utm_term=the+meaning+of+prorated PDF link annotation
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/759ab391aa9f5c0b6cd6b379e3891105/39225195266.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-17/20210617124637292119.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/27c61db88354221a5e7b5273aa34c652/wumekona.pdfIn PDF document text
    • https://paperland.bg/uploads/file/81787767142.pdfIn PDF document text
    • http://93564497.com/userfiles/90422896286.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u0vlckll070iqn01id7fgdp6le/zegagolatojugila.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a668df4c---79727641671.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0a156b8215c6425eeaf516298d233332/41186319613.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/49072550991.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b094e0da6b---12632687556.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6n5tc2nid55a4cdbrds08fbnkc/62857349666.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/58793719253.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/pigafuvabanujolumogosire.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0a938c63e0bd7321c18e17bf965609fa/morukamuxigomonutibid.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/54822190937.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/wivulegem.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/13589fb658fdffa67e768b0619bd8a13/kabilisuxawejemisegil.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4c8353ee---15743526292.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c920f09d342---zibuvakoxexiku.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ecfb866a---89769942012.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/4ca0ab9226ae6cd2cc82c1f52ef0c531/bodubujaveritutume.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff9fd3d69---sorevipamiraris.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a43122c5f74---80190720944.pdfIn PDF document text
    • 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
stream_003_off00012bba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BBA 18944 bytes
SHA-256: aedb066157eea4a38c1cbabab2f0dcb49ae2f3ba3c5473466413b52c45dcc246
font_00_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 25828 bytes
SHA-256: 7ddced9cd36b823f1f95b8af2b3fa6c195bd2a840d1a9b33cf17abe0589c7c4c
font_02_sfnt_off00014b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001631a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631A 10696 bytes
SHA-256: 71975fd9c63de28b498a8fc132352194c96ad5c4d2db55d767c8fe9f6f788de2
font_04_sfnt_off00017b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B28 4752 bytes
SHA-256: b5fb918b6ea219f08531cd0f9f4bf94ad525fa345687481d064773cf2405aee6

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