Malicious PDF — malware analysis report

Static analysis result for SHA-256 142bb83d2755df16…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 02:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3779a48e805015284642f9e378998ddb SHA-1: c3f61daab7bb5f213d6fd88b6060f7aa16195b3a SHA-256: 142bb83d2755df1631d4cc0adc8a69de3f8d62e3f3f200d830befc5b205a2938
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=advantages+of+monopoly+market+pdf PDF link annotation
    • http://popmetre.com/news/files/xojaz.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/fodegivixuparujekizif.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kavufamowetazepu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe258eb8ee---887701101.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b7hgqpq6711of3e090inhhb3p2/tumafoxat.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ddc2ed47---petukijojovuvezutetaxadur.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/23514257542.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/262d12c3620c80e45ced252904cf2e31/13997874174.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/7015188565.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/ralidokevexegozifowo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/aae8d7b8306f558a12b15a5c19d6e0ea/82889741442.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/10581955789.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/10862687498.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///58082129510.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f30b12d5e---27545723249.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/sebugeritazimifivazem.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/koluviwetibunen.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/tosenoz.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f8f3dc0f---28954881586.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160710b5e6f6f2---wosodifixizujog.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/wifaxakosafavaxolalat.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/xuwutanorimage.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/34735392854.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161262bc3211f3---luzaralatukeju.pdfIn PDF document text
    • https://luminex.pl/upload/file/dumazezugivasoxipajive.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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 17028 bytes
SHA-256: 612c989cdc2ea4a355110305a8c1228dce2274ed44c930a8646fdaa4d56ba70d
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 11000 bytes
SHA-256: ac147bd8fbc14e633beb4ba4dd627c850909aec506821416c679fd1ad2bbb625
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1