Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed28caa22ef0eaf…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 11:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bb6721114eef07ef53e6669eaa69db92 SHA-1: a266216a2cfa5532bf810c77ddc0b846271a73e5 SHA-256: 1ed28caa22ef0eaf4e3caec877aefaa821a47e3ccd850d2f4eed1899d95b2b48
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c48739ac---tepekokevonumirowi.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16124b79975ba4---kiduturifipoxod.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/64865629629.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/11059157652.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/85630048109.pdfIn PDF document text
    • http://cecev.com/stockages/files/zudogilujibekela.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/96650101654.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/49790324854.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/wagexid.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210607_210725.pdfIn PDF document text
    • https://filetorme.com/upload/files/nuvinalekuverenujapasi.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/50344321670.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/xobapirezaborirabob.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/rulakeniwaruzen.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/gapuzu.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/vimejiwaboxisemadilose.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611b23f39e8a6---wakajixabavokaviduperixu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c357d3668f47220d0f0e4d102a9b0800/47311340182.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb036a3f41---53764451796.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/14041212c80dcc3c08d1f2e2a411ad51/nexuzaximazepukom.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/88486240278.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/9826271070.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/3982632714.pdfIn PDF document text
    • https://aspirans.com/files/file/72981466953.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/kigito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=panghalip+pamatlig+worksheets+grade+3PDF 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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 18380 bytes
SHA-256: c9bf35d6c132852a00cef9d377d26a5678ecd9a77e4190cf15effcc9e97050d5
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 11192 bytes
SHA-256: 5c942784aa1548cc549cce9fc39f4ce397baa6eab725f4742eeacf20418eed82