Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2649fbe8988cfc…

MALICIOUS

PDF

133.3 KB Created: 2021-07-03 14:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bdc37188901899cf8bde8085db0983b SHA-1: f9859eb84964a5cde28529517311fbbc24f39b31 SHA-256: 7b2649fbe8988cfc0232df5830bbe23f73c89812b43b150fecd0eb966f6add0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. This structure suggests the PDF is intended to act as a link farm, likely to distribute phishing content or lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e8834402058e10fa556c18b05371a7cb/36837788613.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/cor5rg422h52l2ci6plc340glp/lopilojabedana.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a345c255981---tedemukuwujuto.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/difuwapukawemagib.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b14c7de1---84572968715.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b21076d7362---wajiramazelutelaxa.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nezinipifiboludir.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/76410764001.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ead8e06e0db37672baa85824308e3c30/mafimejubotodujafe.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7824a1990c72482e92da953435a33a04/figabenipuminorepiwip.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zakoroferat.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/97267f3750bdb859bc4b72d2eff1cee6/34384849451.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/75768231323.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/a8f8aa15cbb4a20f66381d7531563280/85434736522.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hbe0vftdmg1e2o9dt6t6qmjfmt/42672096709.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78317aa354550c12c76e16a26ff90a81/xatuvoximerugijupuki.pdfIn PDF document text
    • http://efrex.cz/files/file/4230804462.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0eb210tnj8d135g7b96v6crr99/wepijijot.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xikupexibirozavek.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b6c4a3f4bf0421e591c4e5f1707f08dc/79850362902.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080de0938a36---vunizu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1c345492---55902920038.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/16548995299.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///netalozizidusil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=long+words+that+start+with+fPDF 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_off0001abab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3C2 10496 bytes
SHA-256: fe032a2378f96fb2d6b1fc03d7eb98c80e547e4678fdacf757a4cbafe4be27c0
font_02_sfnt_off0001db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB67 16448 bytes
SHA-256: 093e2468ad6433fc12ff0897f9a84e25e8b4e98d1b533ba26d0340948cfb721a