Malicious PDF — malware analysis report

Static analysis result for SHA-256 b887623fbd0f4634…

MALICIOUS

PDF

99.1 KB Created: 2021-07-19 01:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d0cda3ed47113ea3672290498df23a9 SHA-1: 4ea757a5134db17f07472a764eac18018454dd91 SHA-256: b887623fbd0f4634f48144c84d258b600ae2507a2912225e2f68f6fea02d3265
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting, likely for SEO poisoning or phishing. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7128d0dead---49024358405.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f6df591bdb2826412f125546aa04157/83301596705.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7961d93f87---lupazotozajenanelewogezel.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j9nom7j8eskvc1v906rgg6g2lk/gafimosilepubav.pdfIn PDF document text
    • https://coluer.ir/documents/file/56334265767.pdfIn PDF document text
    • https://avela.md/userfiles/file/52602740101.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/270535852.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/pepojadiguveporosugupi.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-17/20210717002300666453.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/13843780737.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/89405952076.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087318a9f77f---24869098810.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/71625460544.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/15501155675.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fde8255074b30175a8e194403b4ada03/90259487769.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/7f0v6rlqmgc3q24piu5l9aj1md/95424649300.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607774b48d6a2---kumadikedopaselem.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/fuxisenoxolixuputaga.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210520165425811515od0pgd.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089de45e3a0a---38801959419.pdfIn PDF document text
    • https://etadelloro.it/images/file/1943108258.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/pisugo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa57c70d0---puzesutugareromugozimusul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=icd+10+code+for+chlamydia+screeningPDF 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_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 17176 bytes
SHA-256: 584e68990eeacd665bfdac8c465bbfdadb1a484808387ed8fbfc31f94c3bdc3f
font_02_sfnt_off00016449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16449 11064 bytes
SHA-256: 8d00f5e9501b355ea0f35cd744b297c1366252ce1f81ad5784ba4605235efd48

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