Malicious PDF — malware analysis report

Static analysis result for SHA-256 856eb861f811b8e6…

MALICIOUS

PDF

93.2 KB Created: 2021-09-01 14:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cf0724714c0136cf06c58c63be6437a SHA-1: 0088a65f904b370d1de6c5d5b6ce6cdcb9c35a67 SHA-256: 856eb861f811b8e6fe8bd272d88242f42944f5915cadfe13112b73230fb52fe2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised WordPress sites. These URLs likely serve as landing pages for phishing attempts or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=10+month+old+blood+pressure PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/44a4df24efef29329fdc4a5640db5cea/nifixufizalusuvimajav.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e6eac84a---wamipalovarebu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/11f6a3072fd23e477e0cf2344c7d2460/zifopujemarizisadofitu.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/banogopevo.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/bowijamurigubobebemoxi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/66b93e832d1ee9c9c949c8791bec6a06/savusivomeso.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/tagapafusupew.pdfIn PDF document text
    • http://www.toptehnik.si/images/dagixobevugemuwafovil.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/xexusetovitosodoleka.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gewazarevolexazowokanof.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d307f3d16---fitudujobed.pdfIn PDF document text
    • http://trovas.com/userimages/44709271361.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/maketaw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/66ec5076dfa38c4bb6477293e2eeee16/kinavimavidinunudukilik.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbde632688---27837051869.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wopizodubegugavejupotema.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/bemokuxebadimadelupup.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6qqr863rb6sdn9b3hu4254vbu2/raluzekejotigo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1d1c49675---lurakuwazerunetoguwi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0bd9a4b903ac3097dc3fd049a4119723/16580005177.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/74244862542.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_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 10720 bytes
SHA-256: 3a1757771760a1fc84bbe11cf1ba2f9f582a83e1ae943961e7d2307fe871ce03
font_01_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13638 18976 bytes
SHA-256: 9765ea2cd665e49eb93e7721015c7e6db5d7f1c771cfdf480d8db0afbfe67445

Open this report in the interactive analyzer, or submit your own file for analysis.