Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ba6b29c60e1d17…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 21:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45280f4783abb6a7574def441e44a669 SHA-1: 1c65216fc4b41130bcdea2b5c478703f85b93f10 SHA-256: a1ba6b29c60e1d17de95d8efcd5e6882423225791d18d15f456cf1192b8fa0ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It contains a significant number of external URIs and link farms, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution scheme. The presence of external URIs suggests the document attempts to redirect the user to malicious content, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=eliminar+historial+google+maps+android PDF link annotation
    • http://solarissoft.com/img/userfiles/files/86881769701.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904051217.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/41292349367.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/wofeluwodunabuwefagegak.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/46611130235.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/68691602903.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vulevivagubonewevu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/rifenozofavadasewivejek.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/18998169857.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/80444103687.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/73634285336.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210914092517.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/sizokisife.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/fikinanerijoje.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090809163973499.pdfIn PDF document text
    • http://builderall.info/userfiles/file/wubunomukob.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/vunepopax.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/42897702994.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_000459.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fc6d9c35aafcf1a5fdf53ccda4592072/wagaduveg.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gk04o28pakg75orpg43bu899u8/65510888855.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/68223359741.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/toloxevewaraweb.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140baba0b159---pipebebitidivumedig.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/dasesorudilupovi.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_off0000c9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B8 16464 bytes
SHA-256: 99c89783d4b99a75e53ce0d0d3432bc6e05e137d426d7afde918903fbeb86629
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 10820 bytes
SHA-256: 11057e3df527ecafa1abc3c5b1b0fa6dd004c5bb8ba471e30edda7593dce7198

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