Malicious PDF — malware analysis report

Static analysis result for SHA-256 22443539e42adc50…

MALICIOUS

PDF

88.0 KB Created: 2021-09-10 22:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f32ef59749d174973a4658d5b1b572a SHA-1: 9aba7e466c89350a1bed90d1c51d73c6a4aa6a75 SHA-256: 22443539e42adc508b41dbe08823e9327f83f1d37bdf47321c9d985d80b3213f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://spartapr.com/images/upload/file/55816674470.pdf In PDF document text
    • https://negaratoto.com/contents/files/zumunizulew.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/89291408140.pdfIn PDF document text
    • http://indel.sk/userfiles/file/30911721420.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/78855544592.pdfIn PDF document text
    • https://subarini.ro/mm/file/64772761309.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/7891817832.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9884eb060f190c9d4a879da53ccdef10/gitupikezujogokonudemixaf.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/78406667207.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/13955237251.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/21501285136.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/91948525823.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/45321810623.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/ronetijuvunixarugonekeli.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rokajerudakijuvobujozoro.pdfIn PDF document text
    • https://777mto.com/contents/files/25607795162.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/94632856965.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/55144868588.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/wasonixebafiwimas.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc8206d95---detarevubetakew.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/rigisepewefow.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613526e80411b---bagusigegatimimaf.pdfIn PDF document text
    • http://exosushi.com/uploads/files/todes.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161389c122c674---4734882140.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wabopiv.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902050157.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vevuvejonunewitobatidapag.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/87355431973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+video+yapma+program%C4%B1PDF 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_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 21484 bytes
SHA-256: c7da3a13107eb0cab9a1d7cb0c635354b920b5c9c9ce56998a945bc16573e5fa
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385F 10632 bytes
SHA-256: c98edfed637f6e8ef3d1fd362554b3c267426e1b29c328ee0a8d0392f6f15622

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