Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9ccadeab4298e8…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 00:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a384a3571f881d1ff5a3789550dd4f2 SHA-1: 304454f24a86876946ae6de35a1ae5a28a485d9b SHA-256: 8d9ccadeab4298e899a557426b82cf1678088a588191b6269797c5f47c544967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/up77d7su9qo67lkij63mogkgsu/peravota.pdf
    • https://dbjadow.pl/attachments/file/7127585435.pdf
    • https://ubranni.com/uploader/files/60101468014.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4334217acb189a7457b8e899437d38e7/89925318039.pdf
    • http://automsystem.com/UploadFile/file/20210522191314656.pdf
    • https://advance-pack.com/editor_upload/file/jirodavona.pdf
    • http://alexlunacoach.com/img/editor/file/musalatob.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ca4bh6673ft854ne3q8pa7d116/78810484624.pdf
    • http://svatba-emi.com/uploads/pages/files/42425469022.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h0glh4hpakppte1vhl91pbht7u/zuginedulirigovovo.pdf
    • https://turkihale.com/userfiles/file/49175579333.pdf
    • https://batikatravels.com/userfiles/file/zuxidikiritesogufudun.pdf
    • https://dynasty888.com/image/files/20210531_075637.pdf
    • http://syuncyoku.jp/upload/file/kerulajesajadirepo.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdeee759f---19185760753.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba9b2eac5---vitorupodezutida.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925052706b---2983415226.pdf
    • http://toptoptraining.ru/img/upload/file/jebatamenoladewuluwopum.pdf
    • http://raffaelecavazzoni.com/userfiles/files/11623205338.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607820a595523---64212345175.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607014d4b63b6---82910649165.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/2r8j80jt52f96h7t495fs3cgjh/nebuduvuxezozexi.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17df80bc64---87441629397.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what%27s+a+muscle+strain
    • 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_off0000eb5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
font_01_sfnt_off0001036f.bin
9d635de4ce53dba8a61b65ff04fbacf8af408c2b89966454d123c12ab91a6f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 16840 bytes
font_02_sfnt_off00012f49.bin
c94e6b057eab1a3e32426cc9e3de4f24885a7cfea5e6acdebb72acabbd8c49ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F49 10504 bytes