Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b507a3112d7de…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bc1ecbb45afeb4a93b0f1b0192841ed SHA-1: 12588b39e1b22afa112148f25ce8c6a28e51debf SHA-256: a29b507a3112d7de8c4f1f91ea7136ea8b0ce2e1f047576ea0c9bf081dbfd736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://akgwealthplanner.com/crm/files/xajavidenodajubefafuwefej.pdf In PDF document text
    • https://cowichanseniors.ca/userfiles/file/xozariziribago.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb9b7b2bd---vonibuk.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/24183038324.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/70352602481.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/dakomudum.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c62aeb1ffc---9208920464.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd57851dcb---49780319944.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5b629aae---14351907713.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/57311863876.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/bekaregi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f747412d5---jukifubokakaladof.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/98403933133.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2aacbe02---89565404913.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/95971308983.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/30a65905b361ec95d62ef98ac4dfe401/53039281813.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/sitewupipuroli.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/72737972554.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/81388539947.pdfIn PDF document text
    • https://goodline.by/userfiles/file/63535734391.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d5949a04---94400210555.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/75122502849.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/gujutubawu.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/nojepegivejadazuxoketusus.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/jutamekob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wkhtmltopdf+ubuntu+18.04PDF 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_off0000c4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B0 10960 bytes
SHA-256: 35e18dc92e406f04615661d613be40f5f10126822b3dd5c562f7fd0cd606c4ec
font_01_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 17780 bytes
SHA-256: b45e92e7b08d9144b7c011e1b7d5fbeb5c6a079ae386dafdcd1cf78fe135d3c1
font_02_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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