Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bbd0e8c526b4fa…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 23:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70880a0246fdd6775928c5e92540fe58 SHA-1: 9ddaae120a347ba9fd661ba5e892a0081685d5f3 SHA-256: f9bbd0e8c526b4fa5ac52bfdea6c73155772d15d5a3f3fc51e2ca7080f16371c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b38d44c5c---54359510337.pdf
    • https://tedvandergulik.nl/userimages/file/36015697756.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/noes504bqtcpccg04fqnpn54c1/84774597576.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ao24aadqqnrpkeb4mspm7lfjci/53266309248.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133e91ecd7---lobabiw.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/mizonixevafivul.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4ccb8bc1c2d0287698fc6ef7998b1127/xokepekakojelobetodejav.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/9c138c7db417607e6b51af1b81d3392e/23030700214.pdf
    • https://weddingitaly.jp/images/file/tilavimusaw.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9d4dca3e82f0984fc11a74e09b3416e9/gasogiruvorirabijolof.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad55258fa7---xipinerijofawirabapoji.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/13e8aa359aacccc545581e0a6e7cf753/69899415091.pdf
    • https://ferropula.hr/files/32970243757.pdf
    • http://mg001.cn/upload_fck/file/2021-7-18/20210718201808592542.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608570ddca719---9525416740.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25076bb897---tarowerusifututumuvasina.pdf
    • http://7tec.ru/userfiles/files/71087754842.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6634f189---49381036293.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b56333fc9---87050255230.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3fb18cfa5---57649561194.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/t5n8i0ea4ljsjh5p3qg7c577th/zanenugot.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/7phdmp3s6e8ubi0d189mv744s6/sitazuvi.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/4404015695.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/dkit7s8k94n6sdueommpln077p/1277883171.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b32133b7c975c86525821bc0a08b1a70/bitogotisamigun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+get+pregnant+from
    • 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_off0000e976.bin
5ee5c3f74dc65f07db84f76b626ed16196731ec2cd662835bb87aa5e78e9c851
pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10640 bytes
font_01_sfnt_off000101dc.bin
bdcbed82ed6ee4c6a4ae2cfa700549cd3bfbca24ddc1f8da85672d5d88e96cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 17052 bytes
font_02_sfnt_off00012e88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 16792 bytes