Malicious PDF — malware analysis report

Static analysis result for SHA-256 6196c1278966d12e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 12:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f22cc5fe2b350657d99c5ec684d773af SHA-1: 3251743bd8888abd61a4d850bc79a1d96a1f269a SHA-256: 6196c1278966d12e1b1645a094eb5e5e049a3d52d028eacb611a0313cc4bdbcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e8b7c548---45415609574.pdf In PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/24067886375.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/7554242424.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kajajawimet.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/60947939265.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bikoxop.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/37817088320.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7cc1dbf2c8fbe942f8dceff494e7f206/16437138106.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fulejol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f6ccc1416.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/83906885754.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/36074218479.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/simamu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/1740388376.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/mijajigovifegewesav.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/rasuwigibex.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c8cd33dd---78643841937.pdfIn PDF document text
    • http://canvangdientu.com/images/file/lilelinalixivozovujirelo.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/dupepuzopavipuvusifiv.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/jinulewebut.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96873013268.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/33489683753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+cod+points+pcPDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 19748 bytes
SHA-256: fd8fdee92bfcc66ae1ef23aea5c271c62322ec863d388a2b563c6759fdb8c06a
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 10276 bytes
SHA-256: 78b2a1a87b40170340c91419201533c974921d8e7709af5b79b22928549dac66