Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0711cd393512924…

MALICIOUS

PDF

91.2 KB Created: 2021-09-02 22:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67d9cdfcaaaa0475c7c93c152b62a0ee SHA-1: ba88348dbcfefe5730871c71ca5fb888796bbc8a SHA-256: d0711cd393512924d78ead4cc8f573c7da1fdf42800262eef1c0ccdd075bd5ef
156 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to redirect users to malicious content. The PDF structure and the presence of multiple external URIs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=sentence+and+non+sentence+worksheets+for+grade+1
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bfe81jtcgopofuqafukcrs54j1/mikigejegekelad.pdf
    • http://topas.lt/userfiles/file/siwamotaz.pdf
    • http://neonatal-surgery.ru/userfiles/files/86908865359.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae869545745---koxeg.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/60ea0491d23f54d2c4848da24dce2fd8/8762251992.pdf
    • http://aedelsur.com/contenido/files/84955140531.pdf
    • http://mg001.cn/upload_fck/file/2021-5-16/20210516012514282618.pdf
    • http://singer-island-condos.com/userfiles/files/wabosexokoziwawokemizimu.pdf
    • https://deltaguvenlik.net/userfiles/file/nilutedi.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7qf6mpa0i2f5dsjjvephoo7c4/27228427548.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874eba2494e---57747513320.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/94cc831338ed578d8eae7b91a3ff3d05/24687117783.pdf
    • https://stonebuild.bg/f/uploads/files/9244535768.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hg9rspc0mg1tu9ed4d68db7ub6/dekoralarovupijavuvoxof.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/91999732720.pdf
    • http://fitviewer.biz/files/file/68740584769.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106452993823---bekupesijixi.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c28006da7---13735191292.pdf
    • http://dges.in/userfiles/file/63424559934.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/lepatolevovamivezeki.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79283b75b---tozimudagasogisuxebefat.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/gutomuxeradaxoxepoxudiw.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/nifonota.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe50.bin
e1d280e09ec965dfb2b0b9294432cd90efeae65f099609a129a1d117b04480c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 10924 bytes
font_01_sfnt_off0001177b.bin
eb8537b39aa21c9e5a41c5a4253ac7baa1482abf9f272f9d33fa4b27afcca93f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 18296 bytes
font_02_sfnt_off0001470c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1470C 16792 bytes