Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b15fca8731529c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 14:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33975c0a7a4d2e44793be69be0cdd133 SHA-1: 1b0245b53826a3d8bbcc3ad21d285eceaf2e82a1 SHA-256: 06b15fca8731529c54272088f5e5203ee3eefef599d85e546d224bcf139c6c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to deliver a payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=plantas+endemicas+de+mexico+pdf PDF link annotation
    • http://artepcb.com/upload/files/wejogipazitupexel.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/musalegij.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210622_212948.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/94f5e05194c68e64a4b7bcc8f3d48545/45542730483.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727250c703a---44619592088.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/63102253846.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/miwedododafatuduzumaxuv.pdfIn PDF document text
    • https://clinicscrm.com/img/files/91575921435.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/ludenuniditenogitak.pdfIn PDF document text
    • https://koratspring.com/upload/file/xijapigivizebepirugev.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/mobobidurafatepawugemitak.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/35378668844.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885398e7771---61458068859.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd311bfee---pasanipazudabenisopivu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/suwawowo.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/18318782850.pdfIn PDF document text
    • https://asiajitu.com/contents//files/sosabijavuvone.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/xitafotuzejimoxoliwox.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e1d4ceef0---terobavalukudefipana.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210721095807_499981630.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609626604912d---16633752092.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26eb85c959---62729764875.pdfIn PDF document text
    • https://vestol.bg/files/file/26931997737.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/towupupa.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/lumumekosebuxezif.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a8b9bd7bd2d03875f00a436b2fd03e39/97815900018.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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 10784 bytes
SHA-256: 1f53d5cc4f1e525138dfe9bfa1143c5505d28275415018400ed93db57d35891a
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 18984 bytes
SHA-256: 475e932095c94c4e71534ccb7572eab27467a22f5fbb6918370243411d61de17

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