Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f205efd90bb2cc…

MALICIOUS

PDF

90.3 KB Created: 2021-09-18 03:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 994bb7c80340efa11bf9f29f287ebc07 SHA-1: daec2340bf3b0db95483e07bd8d7145886e8e661 SHA-256: 31f205efd90bb2ccc2877779ee57d7e75c520fb8be36a7208c1ce16e38f0da00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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.
  • 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://epmachine.ru/d/files/51583609717.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/18397865330.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dutifavivawepobaxilirubi.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/82435689430.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/fefabukuwinodulidiwiti.pdfIn PDF document text
    • https://cooperspick.com/files/zalurulapafipovegutaz.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139060526153---rujuxexipinu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131afb3afab2---42981102617.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/42796800056.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/55338671647.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/sokilogodomi.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zolesosonu.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gonuwifuxazolol.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/bawodokofagutipadu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/88aba863a403288231a13dbc028c353c/bimokusabusudipiw.pdfIn PDF document text
    • http://lovesenergy.com/file/xilotezasawukafazofoz.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/17665512617.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/11904007495.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/xazesadatagesijamasuse.pdfIn PDF document text
    • http://strandedtattoo.net/file/9094395300.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/majitilekuvobuxagas.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/fevotikojamegoxu.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/21333951628.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/71037707930.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/42525931046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=break+wifi+password+iphonePDF 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_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 19324 bytes
SHA-256: 6a69625fcde3acc7bde191fce6945ce376ebf37fa8da393145c5e4566ffd3343
font_01_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 10684 bytes
SHA-256: dc53e56991fa3c089b31d11eacc5d876f4a9cb847b0f044c655b8370526c62eb
font_02_sfnt_off0001434f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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