Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb4c03ac6a4903f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 02:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3ed89bfb5601b07f1c74d1dc9f1efcc SHA-1: a6aaa66d67089fb45e6b8bca0df9287d94ded186 SHA-256: 5bb4c03ac6a4903f14bbf31f3567674465759732eaef96513ff8d1e94416acaf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs that point to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts, indicating a probable initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=how+to+feed+a+baby+chicken+in+stardew+valley PDF link annotation
    • http://cauthinh.com/luutru/files/52080258480.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2vp7r004tnh9ti0en9s5hvpvd2/15273852904.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jozegofaronutibiwebivipa.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/semojogamalimolegaxakabu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/61a1b5271ae4f6768f3836b6d9c6bf9f/80643048083.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ab0d42b28bea81c0a06bb26a1a887fcf/bivizezodedomowe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b1de1555---bubotadubifunetut.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/masifafunageruzi.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/zirurexezenuxawep.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/21970160100.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/61518704245.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/94190227853.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ba3c17fd7---fazixuxosumutelodaleb.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/fixol.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c77e6046---rokipuwebewuwunenoluv.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/5853127462.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/eff07755c905a9ef9ed58328c2a1bbf9/wekimusitijegofisizuzuv.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/30349327896.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8knvm7tibk3se3pmeef5b3tmss/papelomupetolinawubinu.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/mevofowugamosoru.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8cdb7cc3b5933d9817f5c407fc77fb5e/65020847921.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b80aac41c---17040157223.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2c00495f31aca170d48ea20e3622c199/waxoxaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ab79198a---jijazavax.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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 11060 bytes
SHA-256: b56e56dea8146ebe64db0aaaa0b7fb4c1019867387a220af827657778d67a1b7
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 17508 bytes
SHA-256: 179c99383947c2197cb9ad7e30f4704642f69046731646840310fb59afe2211e
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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