Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbb6ba516b6406f…

MALICIOUS

PDF

83.7 KB Created: 2021-08-29 18:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbcdf1f641a07a41cde72411c282b1d3 SHA-1: 858b554fe1fc877338083728a1c253c64cff6859 SHA-256: 0fbb6ba516b6406f43208f088c2927e1741e573301a0c7ff78165825c3526846
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The PDF_RANDOM_URL_LINK heuristic further suggests these links are algorithmically generated and likely lead to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/72d606d0a32c031480bf0d555c7e25f0/juzafurelodukuzukusipur.pdf In PDF document text
    • http://hyeminshop.com/DATA/files/4917880709.pdfIn PDF document text
    • https://icbacademy.com/upload/files/xamodevikedoku.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5815a188d5---sawame.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/30539633964.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/hfioeu6d0rre5qa4n3sdv6fe10/21937544588.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/23537386701.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/wizoxuginewaja.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/28f94ee5fe504b2b3b971529f8dea9d2/jodirowavuvub.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/41313978439.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3d763cd6---11503181189.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/sisefetiwop.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/lapalekelitijudofukiferu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/j0tijsimkon4l3sit6ebnko514/kusafiwuselirug.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22de463e4e---51819612562.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/81061746948.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b42c53582---nusazojixuteluxika.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/rilabuw.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/panabukukoz.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/lawemozerivikurexomasel.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/18258462830.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202108210415127458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=it+is+a+compound+made+up+of+sodium+and+chlorinePDF 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 18684 bytes
SHA-256: 18ec8a91cf39adbec4eadea785ef08e958dd37955473715a9ec233ff4d52afd0
font_01_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 10936 bytes
SHA-256: e8b6f431a02ae84229ada0ab3a93b9683fb8444216ac4c69fce5ff1a06058f4f