Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa1c31f31e413cf…

MALICIOUS

PDF

86.4 KB Created: 2021-08-03 03:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a59efed7b3daff5feaf7d481f44d4086 SHA-1: 5d762a49c8f6f754b995d06e309eb4c8d08f9ee7 SHA-256: 7aa1c31f31e413cfebedaa1d7b91e8e5a88d05590abc0f28f0d8170b810de301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/imhg04g49o6l2ra1dfd6qv6bc6/naruposijewi.pdf In PDF document text
    • https://ladangmimpi.com/contents//files/jitexetevalelevibo.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///85635560840.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3bcc5dd9ff0009d5b9979038212d806d/92674019612.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f819fc74245---66598903821.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/30002356752.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc6e4bc61---38207486328.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/kqbbc89iheuisok1pc2783kav3/36893284425.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/nelamamonevipalevuzoxenu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510fc4c300---gemasireruzikupirolelob.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/38234951069.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/37508900283.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xenejaxu.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/88768674512.pdfIn PDF document text
    • http://topinsolventa.ro/userfiles/file/17926740002.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/99289826707.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/doluzebinukopekufo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e16b21ee7bd45ce711b6206576ce0cd8/navakox.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091de139b849---78510737661.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/086760b4f4ad28f47732136b4d68ed65/zudobasedezipaduvorufukaz.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41fcaf4e4---kufezofi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/394ab5a31f8769789e503ee7490599bc/9480828927.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/9250698521.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/oholu1qj1gdsfcvaklf97670i6/88157447666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+main+symptom+of+celiac+diseasePDF 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_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 17116 bytes
SHA-256: 24591cefcee407c49f6628c17d3244ad5d817b263aafe023b8af5a3bc617d779
font_01_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 10892 bytes
SHA-256: bf267c53d10a8eb814d1d0449d348d8d5bb3c26dc58c68e9ad8b52469b9af18d
font_02_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1