Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c4212f42115b80…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 22:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fdddbb51697b32b8f2a29c73a8087ae6 SHA-1: e8c5d6985416920c0774d55711f16424d1bd1c6e SHA-256: 21c4212f42115b8050cb4f3fa38dcafb53473016b31f5face53aa421ae3046f1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content. The presence of a 'utm_term' parameter in one URL indicates a potential phishing or download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dabaizhongxue.com/upload_fck/file/2021-5-19/20210519074316145897.pdf In PDF document text
    • http://fipjp.com/userfiles/file/56420737972.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/024b25b448ee89f278b4742da43e973f/95182644908.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/kudug.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210717084659.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/sfgn3mn4r0mfrvtgqk7kaicpk4/tixojiwegatuzu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/548ffdc8de6656d5e99d7bd6ff632d7e/79988912514.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f9e345f1---47032350789.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103cf04aa2---48028093402.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/gazirasositilisepive.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/9702499381.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160719e405a06f---71028309478.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/76989695001.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/89363634895.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b784d46343cbb6b136a23fd0d9a3a5d6/fotododezefeju.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/45540670119.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf53c72145---6076051951.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/tirufewatijaxugedaviza.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bp5o1bm9ta0m8rdlv3fa92o28l/33920701966.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210702_BC020187BC0712CD.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/tq74entkaf3fsdfv9hcgp382ge/mavuf.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/36714b4816aa2b3ddd3f35f0aab35733/96367543411.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/sadelubefesuwor.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/016f14db6ec492dd4f697bd98e072f0b/93445275126.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/nemezerutatetag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+need+for+speed+most+wanted+apk+%2B+data+full+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10848 bytes
SHA-256: 3621d20730f5f8428300bd89ff8c90470662a8141c6028f06fab880b8c510012
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 16708 bytes
SHA-256: 5c02bfb2716bbcad83460951eb4be0c89544f4061edc0c1dee5941eb4945d423
font_03_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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