Malicious PDF — malware analysis report

Static analysis result for SHA-256 218d05d2f2e9f631…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ad9ce024839ef411fc86488fb398981 SHA-1: 57151030b945c8feb45dedc47d23a5acb6876b6a SHA-256: 218d05d2f2e9f631e66afd3e7b2085ad44b500d6b127759ba61880ae88a477d5
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains a lure for a download and critically, it requests sensitive recovery secrets or private keys from the user. Several URLs embedded in the document point to compromised CMS upload storage, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbac5a43eb---81585355160.pdf In PDF document text
    • http://sethhukumchandschool.com/userfiles/file/munedebawosibimakopef.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/47875091236.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f547734796e---43151693291.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/44445733411.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pibititogagoxat.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/76861720391.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3f298d68df392e8a33aeca1f520f2f35/takijapovazodiperijik.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/72852864487.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/saldtg1rhsfp1k1ol21sh3e332/31019884355.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec9e55698---82694802606.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/94801133350.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/vuzunebukusexiwivus.pdfIn PDF document text
    • https://giustofiori.it/file/funafotozisufekukepedu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e97fde612a---45299658680.pdfIn PDF document text
    • https://coevent.ru/upload/files/43325981121.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785931ca7e5---purivalakavomivoxe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/88a8da39230d2818c7cefc81a0f8f850/tonorev.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/dupinisevimogi.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/xewugowegebopuwiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=blank+thermometer+worksheetPDF 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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 10512 bytes
SHA-256: 4c077d306c0ef30767c8a5be8a06a3d1992f2bb603f9e5d62b5e7490b3b48d69
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 18268 bytes
SHA-256: 8bec11f8905f1aeeba48179347cb1483da16611b6f2ae1c7f740be8f3b1a6e99

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