Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74a4d73dd372273…

MALICIOUS

PDF

97.0 KB Created: 2021-06-29 16:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c05a7762e92c57706a349e3159d0c326 SHA-1: efb8fd3c13c6b307867c6a37c48da911deec5338 SHA-256: b74a4d73dd37227326fbc9ee8d8ff696f0d5e982b6a355cbea3ad26fa77d5363
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d8f08764f---3136282740.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a2b90fbc---jefakakunugalaxe.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/si1j67uge6v03t12j1fdmbkc65/junaduwapanasudipilezob.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ecabb18ed---tebidabolevobibajujomawel.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a44388f97---baselinud.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/82617849269.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/34555666944.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607661d687758---61584797800.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/xuxor.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80244439c---10987521335.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8e03e33cb53f58879012870754fe5c0b/12050757822.pdfIn PDF document text
    • https://hssanesteban.cl/files/87828428899.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/92d4e30d832da52ca95da054aef23d9a/sopenefululinejevidawaz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d0134260f5d744a5968b8f952a47da54/58520622903.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/44689092029.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33109002---84463903125.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/98375033284.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0qvipmji48rldmgukpbsm5s3j3/fokep.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/795c568a8a3fc89ae1c449f674e10cd4/daxusurixozegedez.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/407f7fbbe814d5783ff8526374e59c4d/76944401927.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5313306d8e4411e7da97ba8538c74975/banadunovidefuzepiketaze.pdfIn PDF document text
    • http://irths.com/upload_files/files/47470400123.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/1621537925715.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/29004439983.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fac5ab8675---91886327763.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2620905b5---90009419658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=computer+science+illuminated+7thPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 10960 bytes
SHA-256: 399aace9ab65f48abc8e6ad1d69eab7b8ea42fe8268ed701720c33a6dc296508
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 21068 bytes
SHA-256: f32f8827c744f9bc0702f3d2b5bea1476546f204cb98b758cd35265fe99d6bad
font_03_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 17884 bytes
SHA-256: 2e01374b66c18d624a9c92e1ddeb15cd94343e434086883ff8b5ff6023c03cfb