Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1be81c5ec5cc9f9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 10:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 485c09b3865f2b65699dfd25418bb2ea SHA-1: 6f9f82fac8e9262cde3969797286932ac38652d1 SHA-256: b1be81c5ec5cc9f9275f2f7daaa78a14d61e53009a16acd8dae026d16bd265b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. These links are designed to redirect users to external, potentially malicious destinations. The ClamAV detection and the nature of the URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3901

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://catamma.ru/uplcv?utm_term=motto+in+life+about+achieving+goals PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d622c65260---tuwepenezo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/85237875524.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f60d99fd---36731812011.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/ririzuwezozopirimuga.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/viposotenuvekizijovipotaf.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f10ce0ea82e---tojosem.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sabaxakekasesebomideneki.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/63c8814e3dadfeb04fc27e6f44612386/fimaxobiwifexujaz.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/6969745435.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34488c10bf---fobenusuzarokerexumawoziw.pdfIn PDF document text
    • https://ultralloy.net/upload/files/62646691317.pdfIn PDF document text
    • http://01host.ru/userfiles/files/15595131798.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/xadulisokod.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a0716843311ba71b06ee6c47df338b1c/voxabevivizagediwunozuzu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23db3d2e50---vufipojozipawawavevej.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kvsis745c3bgr4fmfvfp428ege/19753589914.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ca8b8d564b07cdfa00c713a8a3610073/9027540518.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/ranowegepimekatuminilefor.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wuzozujeneded.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/90144967529.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/49110114902.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcb57e9612---vetizesu.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/76278822790.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/45013329313.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44a0f3674---zelatuwiruwolawalafakiz.pdfIn PDF document text
    • https://renetravel.ro/images/files/87718475032.pdfIn 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_off0000c5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 10816 bytes
SHA-256: a5910350a7eea4716e1c597360824ec9e41e63688692821f3577760cf1bd9719
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 16724 bytes
SHA-256: 105685229886f10e06d8004e35c28fc644567ca50140a30e5829cd4d30f161e4
font_02_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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