Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5e0e3c4601b8b6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 03:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96c50f05bbec1e64a8eb6b2cd0dfc869 SHA-1: 9b54f93d63d940ca766aff18be5005f74895cbca SHA-256: 2a5e0e3c4601b8b6806fa97b128697ac80fe61af6b77399fc74da00bae74dd9f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the document's purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=civic+literacy+and+citizenship PDF link annotation
    • http://ranjitabiswas.com/userfiles/files/60130939665.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/64508198874.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c8a0b080a33d88986948ad975ffabd15/59076816057.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/19344037514.pdfIn PDF document text
    • http://sro52.ru/uploads/files/67362899558.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/lupaluwawe.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/kuvizaxumelaluxeku.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/55352408998.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfa4e1a4f4---nowumemorevemukuwap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3785f0d2e1---fepitovulibiserajadonabe.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/dojuxuw.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2rlh6vsc8k6fdu4nan2ho8f7a0/7632422625.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ebnao6glq292q0htabjnsadajp/dimujebuvet.pdfIn PDF document text
    • http://potya.com/jodumugapedotada.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/puxatunun.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/bavotatukogevaju.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/63b0ffa04bf0250a53659130c7960638/17016430708.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c024724e98005fac149005db267a5d8b/wizoxirukaramufoma.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/durugudigazepinitizeri.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f88c3b0db08f923783c505d4a06e5207/xivevodometejafuxapix.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/186218a20337b57f5946245888ec9a0b/rirumiwet.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pancl6sr643pd5vn8l032j2bt7/tuparorizami.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/5850702461.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wutikapage.pdfIn PDF document text
    • 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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 10764 bytes
SHA-256: 0e7870350894d6684d1326cc7ca72a494128314bc08ce279ee7d383711e927b2
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 18632 bytes
SHA-256: 39dc7b57555301adb391dccd00639f180e16271057b9117603b4325a03031955

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