Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e574770918ef013…

MALICIOUS

PDF

83.7 KB Created: 2021-07-21 15:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e44c037f095be3890f6a1d7c8ac51bf SHA-1: 90c12a4b2d04fc1dc1941882bb18cbf9fce5769e SHA-256: 0e574770918ef013f1652defa3700f26853d52177b6f0ccddb4bb633284bdee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute malicious files. The presence of external URIs and link farms indicates an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/97a832j0u8kpiptapmare7ppk8/delavul.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155bb80831---gelasojowababolenaluket.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/0lu4cfciq38uj0289qq7qmm905g6l7dl/kuxudopafafisututut.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b60ac20feee515c914d5e65e75cd0b77/pozototexowidogegomid.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5082cbe797---vozuxanis.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/52587259183.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/03lk8rcjokgc1um2b7aifs4pt4/52151140176.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb3e4537b---nobojafoxasedapidub.pdfIn PDF document text
    • https://pindimana.in/uploads/file/judugunazufexaxerugoviza.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754e4be045---judogixokexe.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/58kr0dmav8aq2odqk8h1qe4cv9/10689972674.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/mexovulun.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/23476678416.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b3473562---96187454273.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gifhduehkbhou5ahm4k3n9mg5e/govujafifoforeneleruripix.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/molexexaker.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/853e4da5443ada2c4fcc11b0707d3c2d/7228863724.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bibufajag.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/slnul9k2eual3ci805e4td0m8b/44293015986.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/19368042992.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947f5aac28a---90796709197.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/54568691878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+map+redstone+housePDF 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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10752 bytes
SHA-256: 4c1681c2276343a4d1c6a9a09364ae419d38f1e8e8d6c419194f324dc20e743e
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 17600 bytes
SHA-256: 81363c7d0d2a5d33e1e9bc56aa0c41308fde098626eee579e3e407ada4389e7c
font_02_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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