Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88731e8b8d39355…

MALICIOUS

PDF

87.7 KB Created: 2021-08-27 07:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 498eef6bdb45d5112071f3a825782b91 SHA-1: 92bf2bd948a20215c2d9a35157de64071fc43357 SHA-256: c88731e8b8d393555103176acf3f30551013c27b472b70eeb4153f3c61522597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of external URIs and link farms is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=evaporation+from+leaves PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0bf4552c---zenigipekasedojobirarej.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/46798532877.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/88864754503.pdfIn PDF document text
    • https://successalpha.team/upload/files/kejutomatomagosaxemifi.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/xisisifilik.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lvi7va3kts7p5kam3p6a80957u/xopuparoragaxejokipotoz.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/fugaja.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9ef0b533c514d12ff1b62539f0bdce66/duzejixoke.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/98d594d688c057867840aeb77c7d6f20/rapixarefakavusog.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/47612177193.pdfIn PDF document text
    • http://farmina.ru/uploads/files/74436182052.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/jobuvebepomime.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1e62141f5357af2fa4e86b5d49755d7d/69034778710.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d793228e7---dugitikoparuxalege.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lds21fv4cf24e5s27f1sglfce6/47530155641.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/rofifemoni.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a1b16747---tofevema.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/46312350730.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f607b1b925---kotusuxoxazonewuvudataba.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3fcf1f3e7cc79ba7e1e6a94e7a4f7380/bajoronimadusijasoruz.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb6547555---35961343026.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f85b991eb50c9bd2e54358beae3110aa/37278955011.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_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16904 bytes
SHA-256: c2fa58c1ec7ca5c3130a562bc731868d2b3e03a61b155ddd8d5bcff126a1b83e
font_01_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 10568 bytes
SHA-256: ceb16d1cc6a9655cedf3064f1b5b70e61bb32747d96f76bd551fc5fc572e88bd
font_02_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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