Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c896014a7b3824…

MALICIOUS

PDF

140.8 KB Created: 2021-07-25 01:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecf3582dc1d16d42cb3f87dd1f38c700 SHA-1: e37e5b48610ac46ffe04ea0d5a0940d951c21b0f SHA-256: 64c896014a7b38248b0cafe6426d6f4a1f57787e7833ea6006b01a481d729dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9570

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e36dd804f5f5c46623d36e6c379d39d/wimeteguviraf.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da30253d3---77225039560.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4kuidoor1u9sl22j5mhk6vs067/xolodujalagaloked.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/29498264125.pdfIn PDF document text
    • https://stopserv.ru/files/file/68852512609.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/rimuzetozorepetofag.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce62ec6913---94998204638.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nk7vc6e8rta063ddn8koh1aki1/bizigipibadelemoruv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c09aa61d---duxepipipapopemupekif.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/g4mmv2fbfekjbh91g2dg1seb1q/17178555953.pdfIn PDF document text
    • https://telorgabus.com/contents//files/2344869086.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/74fbe5f200281de311196b25b1f4b3ff/69608404061.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e26c61a0e43d0d9a910455e182d5ccd5/kojifojobolalafawegorat.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/206vbjlg1naui8n8bfehf63je9/89505833453.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/5704593482.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8241c794fdcbcc5ee2748bdf35843335/mufula.pdfIn PDF document text
    • http://chipgene.com/image/files/20210710_050113.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe4f7a668---16667790477.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a75eee24b---31942388765.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/22463518672.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839861b8a23---67798156560.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/72132301738.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b232eca97---safisiz.pdfIn PDF document text
    • https://okvino.it/file/29311594231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=is+youtube+compatible+with+android+autoPDF 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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 11168 bytes
SHA-256: 1adb9028257a2827fc7b81bd78efdaafed2739a9bb798fff72a6e6e81ae4cb65
font_01_sfnt_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 16796 bytes
SHA-256: 05ffd8f292278ec6b32d7978569bd135180a8888b17a8bd0885de91d9cc98780
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14289 90636 bytes
SHA-256: 24ae9b723cf55963c7c8fbf5cd4a51e285f1ff751d1b6bd269543465d5ed7c18

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