Malicious PDF — malware analysis report

Static analysis result for SHA-256 118250896109c76a…

MALICIOUS

PDF

83.9 KB Created: 2021-07-03 05:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e5272b3b3a1dae3c7cb8e3285e099ed5 SHA-1: df137be6c0c178775f63ef91df266b2c6f950e10 SHA-256: 118250896109c76a625d89f4edd1433946073218ff52a2a367abaeb00cf2d8f6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160752a3fa2d82---xonafivorogunokopadafodu.pdf In PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/wixot.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/kokupewixuvexizopij.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a78a53c9f667fb10ba1685b633b3158c/52699638527.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mj9ekngo88fmcp6mer9dtr4hp1/tizorozixegopekopesola.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/xusele.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/90113365516.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/84301552433.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wasozinamumefimov.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/jadevuxe.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ac64743---beropuvonob.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9c5f6faac2161d01512f38fb8641647a/bibamiris.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b59b80c7cf1---jutowud.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vuzufakabuzibubekerele.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/026a2539eaf9d6e47d5eca6ea6de376c/pudaliwesinenapulo.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/63876120154.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608119b9d6be1---66883527734.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/76g6jsekbg2eauossi51as7054/fodumakixuvototodezunotat.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/51197253393.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a987053016b---xuwajetomaxupi.pdfIn PDF document text
    • http://vizcsap.hu/files/file/90773757282.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6f99b4055bd7c9ab98d330ec15e8c4f2/pubuxajodenuj.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497fe20a0b---16837130730.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc790f437---pibaronowegeximeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+sun+and+moon+special+episodePDF 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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 17928 bytes
SHA-256: 1ac34e1338266ce28900bf2bde55f36ec93f02b4ffbdcd6800ad2ba0d80d1331
font_01_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 10672 bytes
SHA-256: 25408f600df9c4ccf764a1ffd5652bf88bf2cb7ac96b1b001bd403958e1367d5
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1