Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a227df878cc97c2…

MALICIOUS

PDF

67.9 KB Created: 2021-10-03 05:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00acc60b1fa85b865b466a3c5dc99775 SHA-1: 49e217b3e266481973dbf487845993443bec9e1c SHA-256: 2a227df878cc97c208f3fe3edb33cd8594ac7ce0e47b6ff1f1c5b956250d7851
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image, suggesting a screenshot designed to hide clickable links. The document embeds a large number of URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm likely used to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://phantasos.org/userfiles/file/suzijafem.pdf In PDF document text
    • http://avvocato-callegaro.it/public/file/sufakigimusikilog.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/bufizovifa.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/zojasaxele.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/muvefoware.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/29204142423.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/fodomolopogezusu.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/69772532718.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/86304282823.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/70013852245.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0ea2f3e1---21331392023.pdfIn PDF document text
    • http://mqskin.com/luutru/files/70005566975.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/tufadozowa.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/49dcef75ac80551c3e445713812deb58/78299141926.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/12372420194.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/gekon.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ad2855207cd1f9e9d367a9e53b239837/32051630362.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6fd81ceb---15513413042.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/rexujob.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210924185341.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/dejulatuzatalifom.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07be8ea1f---2779607799.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/4234544910.pdfIn PDF document text
    • http://korytnica.net/data/files/24463835259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=western+yellow+wagtailPDF 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_off0000af2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2E 10476 bytes
SHA-256: 7ace544ea8d4536086eb072a58c61741a3eb376bb74bf335ab7194a52edfebc4
font_01_sfnt_off0000c734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 14036 bytes
SHA-256: a4605286cf4aa5ce13c51b9f54c7c6d13bfb16d79c9ae503b140b206d6b646a8
font_02_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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