Malicious PDF — malware analysis report

Static analysis result for SHA-256 d260c32a7abb708b…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 03:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cd16a4ffd3cac562a063d88684e2088 SHA-1: 21647a6e095a562e283d11fa28cbac09a622ca10 SHA-256: d260c32a7abb708bd7c0cf914695a81b8977a5593ad925880650a28a1a27b97c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://weiddy.com/uploads/files/202109082342369850.pdf In PDF document text
    • https://at1-turbo-j3t.com/contents/files/69435811608.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/27129295123.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/babowakikujezadajajako.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/watinalufajujivi.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/28240391198.pdfIn PDF document text
    • http://snft.ro/media/file/xisilodibi.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/kinumemadakifos.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/84055815220.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9c3375485---xelunafofenujadoketebif.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/63245419839.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/gidikosuzatovepib.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/87595327733.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/10839486071.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/93272823076.pdfIn PDF document text
    • http://staropolski.net/Upload/file/vexelutanazagagezaj.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/bejipunuxinak.pdfIn PDF document text
    • http://slovoveri.org/userfiles/857201478.pdfIn PDF document text
    • http://greenglobepms.com/uploads/65520567310.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fc32adb552b24bf17a18a04beaa5a02f/ditomokaregedozixebedo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/991242f4b7b1b57f76e5f6a03ac59e39/17736356107.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/91370830992.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccaee8d9a---49423481207.pdfIn PDF document text
    • http://castel.lu/userfiles/files/razatiwowazanixafojaki.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/40813769627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=seven+letter+word+starting+with+paPDF 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_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 20324 bytes
SHA-256: d5e870998a264710722048c1ed9de7cac8cb7276b278046fd1f23ce0a53bb1d3
font_01_sfnt_off000137c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDB 10900 bytes
SHA-256: c2b952f22529bc5c51bbe8dc890a5cf5181ab9f901eaa530fab9540b405a53cc

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