Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c81b47cde5eaae…

MALICIOUS

PDF

89.6 KB Created: 2021-09-23 10:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 423158e75d5fab8d8c936869c65f254a SHA-1: 129b392b92b1ede3a786a556d39a0dd63e3a5f65 SHA-256: e5c81b47cde5eaae8dbe434c9ecc0cb7c3fdecf18a21c1858e0b31ecf4b6a789
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. A critical heuristic identified a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into a shell. Several URLs were extracted, some pointing to compromised WordPress sites, indicating a potential distribution vector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7b9ab102b220e5f08d8c26f31c3c21b4/36463662654.pdf In PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/63205005324.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/tokufanusa.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/95083077087.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/fekubidogujinowupo.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/66742797180.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lerisexumuzopegabajijas.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pipurisezepamuf.pdfIn PDF document text
    • https://tessuno.com/upload/files/6147d2ca5cb15.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/95078688464.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/mufubupa.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132559defa33---terukezuginakebidazigife.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/ratiwewudopuk.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/jamomeburefewojumoda.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/faneteledis.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/wafamekanubuvasiverisepak.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/zigomenagevub.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/87321134816.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/72180300017.pdfIn PDF document text
    • http://newo.ru/files/files/99168650935.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/65188856331.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/xuvalefitelusibinakimi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/12c6469e30e99f3c6219462f1a1cefa1/35535726971.pdfIn PDF document text
    • https://netlandschool.cl/files/vizijekiged.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/30281132172.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/linufategoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=activate+windows+8.1+pro+build+9600+permanentlyPDF 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_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 11944 bytes
SHA-256: 356a94cd5d5c9a33a88e0dba02219fa79d80d749fcb1f09bb76751e1a2019108
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 19576 bytes
SHA-256: 9a2fa9a9fac5cd9fa55fec26322ea5842545c3d1b23ef32f75aa298ac07c5f47
font_02_sfnt_off00013ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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