Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddfa3a266fba57a…

MALICIOUS

PDF

118.0 KB Created: 2021-07-09 12:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 773af6cdc537b93505a9ea02b028bdf3 SHA-1: c375f26e5a7cb86b1e08ddc1f221697636783d8a SHA-256: 2ddfa3a266fba57aea60a86518eab7e1dbb135c73db8b64953376d47cb8dc7ce
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to phishing or malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7v54op5orjc5pv60ruv0401u62/81232383016.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/phoabto0gmn5hri9dn67df8qd6/tegogukakiweralonudu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21d801454---22421787479.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/zibebemopa.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/sakakujaxeb.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873913a9859---tugugiru.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/42700583953.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/43260966654.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/tevib.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/40142663270.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa4386c44b---70257444194.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/22925288491.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/zofapajox.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6f374ea95abc0437b8afa98b00f327d8/pezegewavaragakoratob.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9328847---xonajigen.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a44388f97---baselinud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69dc040293---47706701452.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/zarifafixawusobatifu.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/22219347630.pdfIn PDF document text
    • https://airshow-bg.com/file/tibijodetoporazeju.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae73adc3b1f---90365084947.pdfIn PDF document text
    • http://haai.org/upload/file/62762135989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=acts+quiz+questions+and+answersPDF 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_off00016e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001861f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1861F 10688 bytes
SHA-256: f227c25504137a806ea63dc5c619a17ad47148d49bccbb27cebdb84c61f03d87
font_02_sfnt_off00019eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB5 16988 bytes
SHA-256: 93bfd978135b22fac5352a41571349788eff8b89eecd9f3eec45887a92b673d1

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