Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f3cd89ca8b90e2…

MALICIOUS

PDF

91.4 KB Created: 2021-06-29 22:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed4fe052fdc59007b05d46e030b1167f SHA-1: 794078219cb90cad17084d60a040df1cd7e51a24 SHA-256: 40f3cd89ca8b90e2c2188c97eea5e03f999e0b2c3e7018713524ecb47c9dcc11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, a common tactic for hosting malicious files or phishing pages. The embedded URLs and the nature of the heuristics suggest this PDF is likely a lure for phishing or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961e581ca2a---42379731771.pdf In PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/ronerefomatajuxal.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/92175751896.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/jafilajipepudin.pdfIn PDF document text
    • https://mollis.rs//files/timakomonewo.pdfIn PDF document text
    • http://intergeored.com/upload/File/39195431059.pdfIn PDF document text
    • https://kildevangen.dk/files/4816758274.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8e7f14567caec21ff9955aabbaf37bf2/befejetabamutijizev.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11db6af8a---paxakutusikosapisad.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b934bb774---83457633956.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/98228a1d489111fef87ebaad75ed695b/rugovamone.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/bizorabuxitunob.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zapupi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/mewifonokol.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/kemavapovisow.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a024744ff1---51856646065.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c29ip7p03n5u9j2cb6b05cshen/8184608637.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/57122856276.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c0dd3f92---xogerum.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a85cbdd1e---tevasosaxogebukiradusur.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609730d59676c---76452266432.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zexasegifefetu.pdfIn PDF document text
    • http://hydrem.ru/images/file/50014134144.pdfIn PDF document text
    • https://o-dance.com/upload/files/zovaromebowurupovoworupez.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/busefafojirisanavevijorim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=components+of+business+environment+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_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 10788 bytes
SHA-256: 47b681f2f8982fe396e7becdbaba89f31ede1ef9cc38ff27ebecc53ab8ee33de
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 17300 bytes
SHA-256: 2745bac3e694d3f3fcedfeb5804aa22f53bf8a5bae5a150b1b7a862381214955
font_02_sfnt_off0001481f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1