Malicious PDF — malware analysis report

Static analysis result for SHA-256 912691b7b0dbc218…

MALICIOUS

PDF

85.0 KB Created: 2021-10-11 03:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d869bc0216f6a773d8fabdafd8483202 SHA-1: e0b7845dfd6c1e6c14fd5b5c79895f8c29308e97 SHA-256: 912691b7b0dbc218131d0ca025e64fe9f612d773a5cb44fe68afebd8f93f0da1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://deleersnijder-bocaege.be/images/file/wupigimutadofogel.pdf In PDF document text
    • https://ateliersmq.com/pevron/www/img/file/22494359382.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161516d9fafb7a---27770951291.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/8738265981.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/powireviwufapivixafuz.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/96640949993.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/18a6b0c735f98439d75524f196727849/39220391071.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/20879275739.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/wofekivejifesofa.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/3870260505.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f192bc9c403ad16000e06762b480fb8/nujinewanixulu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16155872c92209---takututixegakub.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161406cc14d2ca---bosupifalesa.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/41739000626.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/56bf5873c617efa268be08a0729f3820/laditalilepa.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/92581695242.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/lujikupixarosadi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/vovinukiwuke.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/senilifikozolula.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/judilodaziza.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gizeki.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/luvadutowa.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/bulufuxebavusisewigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=real+numbers+multiple+choice+questions+with+answers+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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 11404 bytes
SHA-256: 76882e11abe5fdcb19189c184b78e1b5c0c73d2212da79d29807b2da0318d2c8
font_01_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 18280 bytes
SHA-256: 44f0ca632d653d2578fde1fd72e4c77cf8fd7eec553976c9f420920bf457a389

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