Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20715a1e97d7346…

MALICIOUS

PDF

88.6 KB Created: 2021-07-18 14:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6fa64dfeb087834819b52784de1616a6 SHA-1: c814cc47a6038f5e7b668871f56568297d2df9fa SHA-256: c20715a1e97d7346cbeba0956b5af0694947c3dc46e585e694375545cc3668f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload links and SEO-optimized disposable links points to an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d9be6dtpun9di6fvnlq6scs1b4/23901132967.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16090fec3d39cc---42530633098.pdfIn PDF document text
    • https://bursac.net/userfiles/file/donimike.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/97976608694.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cguilf10ot4of7vrqkqvpbllnr/98262870806.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/5784c59eaf8c2955c5cbd3b1f6a938e6/tigironijux.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7e5f07372---50949569148.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/zewavodulafugudato.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/14773244629.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/56476570269.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1717af1f26a77dd9a69edfd7d190c678/86006787375.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5cj1jc8tc3a0eqvi8tpu9a4rfr/laperanijazexit.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6f110fc7f60f32061cb8197b41ca54f8/21624213528.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c929bdfc08---44825598778.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/eef20fcd3c5e99d0628c58d63943204c/72098117482.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/059786dd54e36a4030e747c76e6d9ea0/kemekitadakaf.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f20929fe2---5863656129.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/43710576805.pdfIn PDF document text
    • http://zgic.ru/!upload/files/pezefasorabezazoliveg.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rorovajegame.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/75794507963.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/75410639646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+space+technology+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 1864 bytes
SHA-256: 107aa89393a62140e7bdf8b7dea76c0e32c1db22f9f4c6ea11b4a1c879ad2d41
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 11064 bytes
SHA-256: 1cbf4ae47b20838a404782613beea09e00997fa5f7ee31d747e977ce7b25176a
font_02_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 17340 bytes
SHA-256: 93576df6b2343c75184256d3b6bb46f7d1ba5735adced85cebfd2ad557960cd1
font_03_sfnt_off00013cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1