Malicious PDF — malware analysis report

Static analysis result for SHA-256 813b389a88833438…

MALICIOUS

PDF

90.4 KB Created: 2021-08-01 01:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9065a14903ed4d562fef4e4961147855 SHA-1: 5e6ccbd83f2c6b28268706a539bb6cd6014e5902 SHA-256: 813b389a88833438fda7cd0423cb88cdfbf5130dce10018e128c452d20028cd1
156 Risk Score

Malware Insights

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

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, with many URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of external URIs and the nature of the link farm point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://akifkasaboglu.com/esatfisek/images_upload/files/towofixaruvu.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/noruxepebobaseretujuliket.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/93922239666.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3e463aac---88615261684.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/45935071682.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/moduzisuvoxegalin.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8546155c332f24d46601de37e363431b/56241028544.pdfIn PDF document text
    • https://aristonails.com/articles_files/files/vevamen.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/87065ceaf673d63ddf4c72dc773f5694/pemilelezenegawib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af7000f76---62864438031.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/34073566777.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/85156891925.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c3fc08be744d8ef43789e795f8729895/worelawik.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6df95e214---vidugavaxogodara.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/kobexewuko.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/tuzuzoxorikowusuvulaviki.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c175cd10b12---7632929199.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/nuan524sk29d4j6qd55jauf8ls/42807410382.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kixekizigoremujarurop.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/33856173179.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/90200118589.pdfIn PDF document text
    • https://tmtteks.com/files/1001896968.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/8qubsstaaptmdp4jpvqovml3jg/69989855086.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c6166d6694075d325f42d6d388ff054c/papajabikowizusedine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+an+eviction+notice+in+californiaPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/lozobelupunefiwuvofaliwi.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_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 16772 bytes
SHA-256: 9c295b16bb267512c60e57e56c33b672ef2777fca6201b80dec912f77005617f
font_01_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001424b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424B 10488 bytes
SHA-256: 9d810b4149ba716d1d77b71fcbad1a6932fa3684a192867157bd9595f372eca0

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