Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2ecdee5bdfb712…

MALICIOUS

PDF

91.0 KB Created: 2021-08-18 17:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9142d47d5cb52f54ec765367b4bf6f00 SHA-1: b566088c37f3271d4fe4110cb3c845f78a6c9923 SHA-256: 0b2ecdee5bdfb712031dca47c2b53d198a24396cf6423ec65ee81b5d8e8edb60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/29173431896.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098abc1ca188---ludetavilif.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/wagisokematusepobunomu.pdfIn PDF document text
    • http://didula.com/img/file/66656907853.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2cc50a5cd45a973c4ef0124c0202831a/62263416170.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31608ed0f5c238a31608889285a31562/83315173261.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160826a2da37a4---72986826700.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/daqpbov5k89uff6fuk14cngid5/94262648002.pdfIn PDF document text
    • http://emannsltd.com/userfiles/dupoweletivixemumebab.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/20fe2969e6010b457fefff7930a03286/bagugugolevinovuvupoxus.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/lojafikutijabesisaso.pdfIn PDF document text
    • http://traviet36.com/upload/files/puwifuxusoneb.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f531b7e8d---40810217202.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/mogusafenegotewanigometo.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/ruzunopomiwibopefiza.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a64708e3---xikomemabufefabi.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/9743849768.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/32710981944.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/wenusedizijorevaji.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/81683548449.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55570368399.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbe2e8ab8d---novogujukurovoluje.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3920d79c---86101177889.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160911cd119f0a---logozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=oxford+dictionary+of+law+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10640 bytes
SHA-256: bb471acc6fb8f770a35a9b3244fe4498f7706e7b660de55468d6a8b203dfdf65
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 17560 bytes
SHA-256: 2e0b7c629b748ad65f7e9741aac98f7dc3d4d415eb9a3d8a20754a32221a3000
font_03_sfnt_off000144b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B7 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27

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