Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15991734c67ee07…

MALICIOUS

PDF

86.4 KB Created: 2021-07-30 09:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 706349b409eada22914d8ce646e8b3f2 SHA-1: 31e4aacad590a7c8f1943aba7946b4b88494f920 SHA-256: c15991734c67ee079d374652f5ae7a3f12a5d04cc0d9973bc7773a8eec3e6f53
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's a Pdf.Phishing.Trojan. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for phishing lures or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d52b55f22---9839181065.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff75f44070---84960229532.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/dijuxixepumovapewovexe.pdfIn PDF document text
    • http://hasyo.net/files/file/54212823720.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/vuludeve.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/30488713800.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/xomakixekafugekuzojadef.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d73edf840c4da2e949848d402f4f7674/wuxunepuxozigeza.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/rutokiri.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/6971166943.pdfIn PDF document text
    • https://inks.bg/userfiles/file/64681409426.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c986690ab84---degisu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f585ae22a3d637d34e183aaf626e11e2/66588456435.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faa743edc---16806640744.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gafenusu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/59834445498.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/wudujiranubekusexizinalor.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6resefmsn1c9ln58t3v7jr7jk7/mobusotiwuzigeraj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4271c66df---15118875954.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf341f2d24---rawar.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e1ff3509---45108157158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nonton+fast+and+furious+7+full+movie+subtitle+indonesia+downloadPDF 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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 17280 bytes
SHA-256: fd6364c1f2a8eef6e51524d3ba091c1765728c2e9fbd99371c617adbd4e4ff7a
font_01_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 10936 bytes
SHA-256: abd78d9540a20bba432a1046201b5ebf75a223236d88752ba263e9bd9f9f9e5c
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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