Malicious PDF — malware analysis report

Static analysis result for SHA-256 893c8701188eb33f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 13:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a7364b03b7927245bd7622911785264 SHA-1: e275ac7231ea954794d5afa6119e5051ead36a3c SHA-256: 893c8701188eb33f76c8ea4635b67f0d8dc01cca8d58806a3943c46cf09534b7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including external URI links and links to compromised CMS uploads. The presence of a 'download button' lure further suggests a phishing or social engineering attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=insanity+deluxe+workout+calendar+pdf PDF link annotation
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0e06d845fcdf2a4c264ed89a2457842a/60443813181.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/31996154342.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/41760437766.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/gikodaduso.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/6180374739.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/pirifek.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a8f077cbf0b0ed3b990cd0501b4b1c7b/5821966205.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/gagekej.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215222152563521.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed527c51c---1709918680.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7807938fab015199674dee2e5778493d/98222798260.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/satoxurinateniwux.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/nekifexurepolotoj.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2n7cidqgdkb59of7eu902dg853/19910346615.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1477a270---19366301809.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/35855565197.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84d54944a---tanoxobegemurupuxesa.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/xotizene.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/biperifefojomovozeladi.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fafojojatagokin.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tenuxitovevobomir.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/motesomokezer.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/47193608394.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba34c22458a---pipobetiduderulemegipudog.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/lukibizaxinidexurebibikaz.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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 18168 bytes
SHA-256: e039351f870b95e704d64694d775176d2e69ac9d5a01d15b48e2fb703d7e4967
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 11056 bytes
SHA-256: b53b3e878180a269f6099f64b5aa9fe86a8d9e4ed14b81d2424a3703c342aaa0