Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31bf2e4879c081e…

MALICIOUS

PDF

79.8 KB Created: 2021-06-29 07:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 28894b8554610667679989bf8a8c5c12 SHA-1: eccec3cdcc7f0f46b4167dfb540e948d977beaec SHA-256: e31bf2e4879c081e4434f2d1e0bdfb93f5436d33cac9c09ebc41fd4f13536cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/418b85f48859cd3e16f156cd78850667/57024193620.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d900702fa---bozosunupodadowa.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/68567879317.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/rovuvazubidejalunotonuda.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/fosapu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mdq4jdgti96omv1rkgvucc3dp0/zurodedoxebowefefapo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bakajufejaniwar.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aa10bcaf5---35464850969.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/84387099520.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7f009513---9139444595.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095257b496b3---refekakikaxidelalow.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/11177ed4bdb4e6bf90ef8a728e53ef6f/pedoxor.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee5a58986---kudesakarorabogosuzaj.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/xoduwevadinojeziwefaro.pdfIn PDF document text
    • http://zuche0551.com/upload/file/togokupukopovolonuliwoxew.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jseh20f379kl1c2gb4gk510kje/59792293062.pdfIn PDF document text
    • https://strechybenesov.cz/content/vukidurewukovitexufam.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c8016421cde089c3acb0db34fb13f554/42716450010.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/163e370d251aff41efbba0d5269881f0/fomapodulufej.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c46f4b730e762e44296ee1f709a57841/nibubunepovijib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=standing+in+the+shadows+of+motown+book+pdfPDF 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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 17184 bytes
SHA-256: c23106402bf079ec37de70e58ddf99fdad082cb571337b74f977048c55576e78
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 11192 bytes
SHA-256: 54c8a6e89036c47173409932e0fa97c0c512aaba4c2d8a0f891523bb864077f1

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