Malicious PDF — malware analysis report

Static analysis result for SHA-256 9758736c90fe501c…

MALICIOUS

PDF

109.3 KB Created: 2021-07-02 13:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aad4fac85f40ddc65513e0792bd1719f SHA-1: b96e9067fd454c16560367cdbb1469e4c459a5f4 SHA-256: 9758736c90fe501c67bdc3a59204fea1072fc1a0e9a279f71979e3b1bd736f5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a distribution mechanism for malware or phishing content. The presence of embedded URLs and the 'download button' lure further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/27e1dfd0b0455d4b0cbec64308f164e2/45045477464.pdf In PDF document text
    • http://moscowprice.com/content/xuploadimages/file/37318746082.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/vimusidojawagesopagufetav.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089020a57a31---5002946943.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/cb7ed70c4e922a7c5fbeb83862e1fdb1/gujedalege.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ffe680c2a1946ba3250310163a5e2ee9/dajurifadused.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcc0cfc3a---33105681700.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5c7dddeea5bda30fe0b54047c5178791/giwuganivogutevaze.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aa690e641---fakug.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2f64dde1---kenuzuga.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/11633661254.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/rizidikemenavebenatur.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/566d13e6b197c23b73508e61990a7271/28949949949.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b564c68d4e9---83505335977.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4707b14a---94964021318.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/wotaxomavisobumokep.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc189a13f0---34697619851.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3cbd62592---zufanotiramupe.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/24748541251.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5ec491b08f48e30b970dc5a0ff3c5a30/dupekofoluzer.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7af1f0b36---66733238633.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1cd0d82397eeb872be65d9798e92f521/14037766580.pdfIn PDF document text
    • https://2acontractor.it/images/file/53070025659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=train+to+busan+2+full+movie+link+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001396d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 10856 bytes
SHA-256: 4faf8ad2d04d5b6562f368f7e9c97d4c8dc3fc2ebd4143f814da3e0e4896a2b4
font_02_sfnt_off0001528f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528F 28648 bytes
SHA-256: 52a57a5bbda1937a5d347e1a83a6c50857901f5442db7a4befa10e9d00f2abae
font_03_sfnt_off0001903b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903B 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d