Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbfee5693557d73…

MALICIOUS

PDF

102.5 KB Created: 2021-07-12 17:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 598650c2cc70390aa2d405b8d4b899dc SHA-1: 453b1288db9a2337e295acde8675db7da325cc0a SHA-256: 9fbfee5693557d73ec74d70ed273c9bb6c4a29fc51aa6e1e8b37364348ae08b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de016692790---66283279545.pdf In PDF document text
    • http://seabeachthailand.com/UserFiles/file/gulijetanikinubatoviduzab.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kugetadamemujemodamifapof.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d09e80d4ece---sunixoribajalovi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cub47tbusd6likek8l92np5uqv/79585435257.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/037320f6b7742776693a5f7471dfe67b/darevas.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/51eb0f7b7e65ca87dee4e772b4959d0d/xuzeses.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3f33ff5a91ecec40b91e975188920f50/fegonitobeju.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad8dc499f3---15871480190.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/13407184428.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/80433959123.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94816252f---94892276494.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_194510.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/18318405834.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083324a6b644---vejebexip.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/po4nd7giqddj6u25bcj1mjnoqc/62030002397.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e650556c---2524789598.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943be074dfb---35509342258.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3ae29e813203d12e3ad393e9bb22e925/jimatipotusubawotetili.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/lonum.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/397be4fd30f197acd67688bb9fb9e088/78107315964.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/79204267545.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c75485ae106---kolakusanisadinamisi.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/rusowelapumuwafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=spanish+accent+rules+pdfPDF 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_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 17460 bytes
SHA-256: ac47e7f65c3a749967c8d2eea182a79e2878af877047a6174cbb979f064e9208
font_02_sfnt_off000172ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172ED 10772 bytes
SHA-256: 535a2f18b53d47ed945aca98382661a04076d00fdc7c70647fe74267311d7264

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