Malicious PDF — malware analysis report

Static analysis result for SHA-256 d184528d94daca23…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 13:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19fc3c6f78bf9ed3dcd417f253670d1d SHA-1: ca199852e19ad399acf9ec71d6e86911c8643d25 SHA-256: d184528d94daca2395559535e9443c9d54f3c880a493cae36596783dd50edf87
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the classification of this PDF as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=wifi+pcap+capture+apk PDF link annotation
    • http://altadirezione-consulting.it/userfiles/files/40864909820.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/92604958058.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/35335986012.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a98ea74c---38092689557.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/dudutezupofimikodamok.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/17431644644.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/2925806334.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bdfd66d3e---lixepujedakukorixuwivug.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/92424708731.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cjgmannlb93biaalikn18c23mp/wiwonawuzapakowiwi.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/43449225409.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/84388905454.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/19600755857.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rugijixakunutibu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/doginog.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/64667466925.pdfIn PDF document text
    • https://curvy.tw/upload/files/35457976357.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/21643336882.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/xekajefixavusedogigo.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/jemesilalaxabubix.pdfIn PDF document text
    • https://hgb.se/filer/file/gapalibusa.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/89837718192.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/10701248482.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/61929916264.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/didujepe.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/25850883417.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903002508_lxnb5m.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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 20636 bytes
SHA-256: 9dc9a32ff80cb0c4c07f23a3a58ebff10c29c1f844fe0a455415f7cb750617d2
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 10220 bytes
SHA-256: efd6a45e9d76476840a384cc181ad7acfd83a53f79a96652d5170986b0096092
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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