Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b680166ee77dd17…

MALICIOUS

PDF

105.9 KB Created: 2021-06-26 22:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a3ec94bd7112891290064ea6e6dc917 SHA-1: 29ba770c2e81dd25396447630381133f980fcf0f SHA-256: 1b680166ee77dd17d5e9969ae6580acbf0e900d88f3dd194271e74b6a7e03d01
216 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery information. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution mechanism involving malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h5qfjhsasktrkpemb6pr65kl20/worezupu.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d758c036d74---46107453436.pdf
    • http://mesterek.net/tmp/97531032229.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb80e35159---nabasatadezebaxefare.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdf48cd61---fesixowomesujivok.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1cfdf4170---jajusemovus.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3000caf642---mokamonipupasekazarolijoz.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/524b7251e31c931983f26ca2c055fc32/20263876167.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/71657275846.pdf
    • http://studiorinaldibedin.eu/userfiles/files/xulojikisogipoge.pdf
    • http://jump360.co/upload/files/20210624010233.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cauc3orb6hgjqbu4bho6prhkfr/79418146616.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609681bf0c01e---jozojojirirep.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9b6431a3b7edb853acbd858600ff792e/5407614992.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf738e7d58d---zukarosetagemavi.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33d0d2740f---63055427925.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qkftdu9qmh7dan86tsr3pcoe77/40447015412.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72d74806---8364182141.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f81619h2j01tnqj8tnb215pp83/nerunodavifi.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160728eda349cb---babekelivuruzobawuwexapa.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a793d3895---sesovomariwuben.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160983f0ac5017---dofosuzukimazidelejab.pdf
    • http://@[webservicehost]/MyWebService/myservice.wsdl
    • http://:7001/em
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ejb+in+action+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_off00013d97.bin
1b487678cd818d0528853b5ba0b05f0cc9d234c4a98615d4fa5b990fc748daab
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D97 10420 bytes
font_01_sfnt_off00015504.bin
16dbe7de7b8aac6b4c2a1ec907359bd796ae4474b5530c2a9f5220ef6f56f195
pdf-font-stream PDF embedded font (sfnt) at offset 0x15504 17148 bytes
font_02_sfnt_off00018242.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18242 16792 bytes