Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33b8c550e565189…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 22:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0b216b8678f1120d4bd2b413da6a454 SHA-1: 4df6907c7fdb6e8dc4a2e19158a1349a0e625c7a SHA-256: a33b8c550e565189c00c2888d21bf364d392c005e93d3c96bd5c10a6a06cafe3
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. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose seems to be directing users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=golf+clash+hacks+that+actually+work PDF link annotation
    • https://whiteplacard.com/UserFiles/file/sudik.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317452d8f36---43895143175.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/14285307907.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9r3s724tj5qfr3sev5dcpd4gi8/91019124431.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/rekanatogejezewenisoji.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/volig.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/41638611609.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/sigitososamuxaz.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/30764530943.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f097c1238---9216042590.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/reratapalabipafiju.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161398e48ad856---vukexanikugano.pdfIn PDF document text
    • http://gespk.com/userfiles/file/74544422445.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/rebewep.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/golusel.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/kevena.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/96880240509.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2f831c6d253ad68d1664f0371378b070/94333248365.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/potamalatev.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f917c3ef2---2861434664.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/dakotuxoxunibikalurop.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6b8e27b3c2a0eb676c6aea6f70274f99/50983293989.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/74697547683.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/78993227875.pdfIn PDF document text
    • 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 17488 bytes
SHA-256: f8cedd854b0ac4c20b515c74500f2a91a49aa047a787a4a96f9d0793b004b732
font_02_sfnt_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 10536 bytes
SHA-256: b7f6ba400db336dc6bf071789ae73fdeaa05bb2bd366e0fd4fb925673fa72348

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