Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a81b8fc08a332a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 15:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5be9d97a5e0cba132aa536c9d85b9083 SHA-1: c99baa7264bb8473ba042c222f0fd0e8d3557205 SHA-256: 59a81b8fc08a332a9ca15bd7dbcdb47531129f2ecd4227f9d75e04d0aff6c343
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=reading+comprehension+worksheets+8th+grade+printable PDF link annotation
    • http://inspirationforexcellence.com/clients/66491/File/lowobe.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ld2f1an5rq8b102megejv379c4/rovigiwujanareriwidegiduv.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/wotubo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210519035554.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c937b58b445---lebumojajo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/hkng850oonqnf1g5ea248l0hm5/88066522940.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2e2b3308---moluvomuri.pdfIn PDF document text
    • https://digiconelectronics.com/media/sixavobuwisugor.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/selidavi.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/nujijezasali.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/64760965736.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/fonenatulilawa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/akks0lo4ll0pb7104lcn4o43cp/polipenewamuxa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12eedc59e---vimovo.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xexupowukosedalafabuwe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/79216675874.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/pejodov.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/wewir.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/lenalezokokuvupaje.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f355bf8a---zurulitokalokanovikemu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1b88b2e9---zosebukukij.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/3ef756b7a4c06a032d975e5f54521c97/90405693133.pdfIn PDF document text
    • https://hssanesteban.cl/files/berukot.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fbadee1aff2---59952127751.pdfIn PDF document text
    • 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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 14324 bytes
SHA-256: 9bf760917b5df1322a4fc0b08e47c9a1258db435bbf9c485c9ddcebee1237c3f
font_01_sfnt_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 11532 bytes
SHA-256: 73f9292c159ef652aa685536f3f10f38f9707cf1c02cb9ecaf2f3a885fab6121
font_02_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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