Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4572544aeaaa494…

MALICIOUS

PDF

84.5 KB Created: 2021-07-13 17:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20ddb100b3458dc340f0370443cd9e3b SHA-1: e757d78b155ae6ed97a5d1d29ed94c2a53641ca1 SHA-256: f4572544aeaaa4944528210a59bda930f8099621fcb90e5c86e4be0d040ce46f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing or malware sites. The embedded URLs and the overall structure strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=word+a+psf PDF link annotation
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/64271304269.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0a3472d10fc854256989170aef0632c7/22313341156.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/64282697012.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0bc60d97a---59133524589.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097f64430d14---8488837172.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/33057598084.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/danek.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/49799878736.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaba80d51d---40175227567.pdfIn PDF document text
    • https://togeltop.net/contents//files/devado.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/40971816138.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/90c0c927679b0b76966cf4094683e1e4/kelomokodometurigumeludip.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c1868fb63ef833e0c230fcd4e35e6bc3/tabimugixufawopilet.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e41f77ed53b97fc2fc8784b7181482d1/13827934002.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/49099165152.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9d0162aafaf8d084a88e0081525a9d85/wiruzawimogisaxup.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fecf2b1257---86114947268.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fd04f6a314ab944750c8688423b1f32a/36214331892.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16213660819366.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7dhm6f4rfkpqp6j3s6rlk3at6v/41172318645.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7e75fc217d8ea700343feceab1d26817/pibotudifadotog.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/56970168056.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/melavekonumebatal.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/titavunaj.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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 10012 bytes
SHA-256: 9afbbb57228977945b32215825f3f9898447cb2b87c4dddfc2a4dab7e016b60a
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 17148 bytes
SHA-256: 5fce8cbd754a8fe78662643e49c58df34e256ca160cfb8dee600364cf8ee33db
font_02_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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