Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac011faaa0dd608a…

MALICIOUS

PDF

81.2 KB Created: 2021-08-17 13:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0229bcd8b581dba5d18b9df4c745ecf SHA-1: c9cf5408703c5620c6f3c7af2d365a9892c389b7 SHA-256: ac011faaa0dd608a5ee324e59f08059970fd7915b4c11d9449633abc3d10f272
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of numerous links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837dec0c2d2---5644604399.pdf In PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/76136559502.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f93f966c2ec714da56d1e2c7401efb4b/lelipuretajide.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/21706576976.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/sokukevevawefisok.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/51836745935.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/reguzediwofakibuvirobi.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/roliwixilo.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210707_964737C774127412.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f34fe3f46---87310053750.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/49ecee5f0bfbe8055f62aae27a460baf/76051403997.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hh4sm1vrdmcopt8pp7c9jjjiu2/90424566086.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d84f49d---jujug.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/4b39e5d4c55595afb42b3c79c10941e7/jerix.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f113fa60083---89451488527.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/542bb4827b7ddea11ec90c669c72e619/nitalezevubejoxejali.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb77eb6b5---wovuvevujagav.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/15177200158.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b4d2f6d3---33144168748.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/i7saup068d6ceir03qe84oetts/43386654667.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/5dsr8nv2v45qmvfn2u3j77d141/xuzovasakafetejamoxuka.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/94260897011.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/42729875729.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/27805691385.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5672111c1---vezipuvibosigip.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/846f801a7bdd1d011b8e73533a548616/2783703193.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/gezoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=certificate+of+service+florida+samplePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 16744 bytes
SHA-256: 8f2e9848d3b70c0e28821749f10c81674a56bcde795952806f4230c5cd706404
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 10772 bytes
SHA-256: bcc38dfffb3668a86cc7db758e6a41b7fb1db5d76cff6f1158b7001b14ec3984