Malicious PDF — malware analysis report

Static analysis result for SHA-256 96846c48db5792e8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 23:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f4278c236b19459b2e8fd53102c2f31 SHA-1: 7c5b5bb206a9c820712d0952013182eaaab31ac8 SHA-256: 96846c48db5792e8780874e6b5b2c72fe003ffc4d37c559c2d57e5889e2aa621
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, compromised sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec989db3540---lipuwafemawobomulil.pdf In PDF document text
    • http://flightshop.jp/images/blog//file/89638495285.pdfIn PDF document text
    • https://magatek.com/documents/file/zavuzuxotilosolakuz.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06df3a8475---54039256569.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1869120343.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/44494006985.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/fosuguxukenulazojafer.pdfIn PDF document text
    • https://andrejc.si/files/file/todidibudidixude.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430160041356629.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/kedubolasajo.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/90669781015.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5211mln045paat6n0n5kmig3t6/redugana.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a51701897---71521876602.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/137cfa6faa0ceb03fb0213965904216d/21954650594.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/44394298339.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/xutarukugepepi.pdfIn PDF document text
    • https://energooptima.hu/upload/File/putipasasozumonosepafe.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/52905792261.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/gibawutiwugerepatapati.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/2hrfrldshpr2n259bhad3h8cgr/gebonigipupusuwek.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/76609246257.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/86254208001.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/7575761142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=daily+routines+matching+worksheetPDF 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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 15556 bytes
SHA-256: faaf837463d5018ece574334008c44a3f7e20b19916626e6c1c3b1ee760e52b2
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 11072 bytes
SHA-256: afd9be166f2710521786a488bd0b627fdec6421b21531675325530c1c6d53018
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1