Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c33a1264f8c6a7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 10:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36779ea5bea8e5602a2126781b586688 SHA-1: ed475c96f3020c7dc1ef77fffd1317d425b191c4 SHA-256: d4c33a1264f8c6a7ea8350dcbaef27fac1ce8eb22e5311c4cbf62c4635d95c8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of external URI links and the overall structure indicate an attempt to lure users into downloading further malicious files, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=new+english+file+pre+intermediate+pdf+student%27s+book PDF link annotation
    • http://thankschicken.com/uploads/files/zinevovazakalefekezesepoz.pdfIn PDF document text
    • http://one9five.com/userfiles/files/masakumibimugos.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/dusatabudulotajejovitakof.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac73e32c1---mosaruzilagoxamob.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/zilanovogupakafi.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xevuzijetolewoveb.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815d84f7e9.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/lawikurebuxok.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/901qe3vi38j8j45r6r0k8qsjv2/memapumigazemugokisa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d984bdffad3518072b462650eb95d629/15539909884.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140933cc4c74---30582148131.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/82836994050.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/36670274207.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/tatefulokumufupo.pdfIn PDF document text
    • http://learningkey.org/userfiles/zogajuserifebexikin.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/vabijenup.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210903145008.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_47_03_6097.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/kekikofo.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/36801097497.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f52e8281e---ligufonujemuwinezuliwal.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7590af27a0cecb7cdcedc6f983b478b4/4454255960.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/dujivolopomelekotexeti.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fonawasanokizosebavuxeraw.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_off0000c1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D1 17400 bytes
SHA-256: 268d4f04bf41ebf4fd8b39415cb95f47c8d1062aa613940fab55a5ab9493007f
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 11372 bytes
SHA-256: f3fd4cdd9899be0febcc4834cfb010ceca0d13044ce492d9766e894a9179a0c9

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