Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac024a7c2217205…

MALICIOUS

PDF

77.6 KB Created: 2021-09-27 21:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6357fec535158c1761026bdd3ab7425c SHA-1: 93a44b53d77844893eb16b224d12711c2434a196 SHA-256: eac024a7c22172052f2a9dc47e2b396364faacf279d5f09f7c3cca7b5720eba4
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 phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to potentially compromised websites. The presence of external URIs and link farm heuristics suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://wastran.ru/uplcv?utm_term=unblocked+games+bloons+tower+defense+5 PDF link annotation
    • http://www.macrolepidoptera.hu/userfiles/files/5699743541.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/nijepufim.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/96379595258.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jaxirigijin.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23445355030.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/70166804716.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/17208907512.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/zepajubixonesobunatonakak.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/49552152340.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/liqan4tu7st36pkr0lrkitt8if/nadaxilutokeseririgifa.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/77656575652.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010607543911.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/74679418309.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/winokajuzanekegiwu.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/73673809204.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/xunirufupezi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140812cb7---76705042543.pdfIn PDF document text
    • http://17njl.com/userfiles/files/51432909385.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/22631213974.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/23423848810.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o6j5c18o1nigaufib3um0sljfa/lemijilofokop.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/97587772938.pdfIn PDF document text
    • https://matricula.arendic.cl/files/86763136577.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/81119295961.pdfIn PDF document text
    • https://tch.lu/files/files/31097653472.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/67795313988.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C0 11188 bytes
SHA-256: d9471a5167a6da181c74b4b7ac546e2d754f0a014c43a71868ebedaaaf359bbb
font_01_sfnt_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 17340 bytes
SHA-256: 56b5f7184c927569c28505743775b192eeb4ba7c62636dab1dc817132ded37a2
font_03_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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