Malicious PDF — malware analysis report

Static analysis result for SHA-256 c975af98b4a1bb95…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 15:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ca5acb76ec079f38050090d2e9d20b3 SHA-1: f5b63200c6a704e52d9f7760c8f2dd31df08eb25 SHA-256: c975af98b4a1bb9503334053cc72d5a1b3e5a2815e159c8322b915cf8dc442eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection name imply a phishing or trojan distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8db408581---jozujinuvaxetukixi.pdf In PDF document text
    • http://peusch.lu/userfiles/files/82627006702.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/89705263774.pdfIn PDF document text
    • https://premium-house.uz/images/file/saboganawafa.pdfIn PDF document text
    • http://roocenter.ru/upload/file/40259268104.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vototetigowijesaz.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/taminezonatowimotegeje.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/12288725984.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bgvk774jt1vime21i7d3ule74r/zaxegolibavalitosiv.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/besaporenoda.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/442738ced7c3a193ec4e449ba0ae0c2a/92012792414.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161186db570a3b---legevew.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/6728901763.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/913f0a9785391b5b2121a0e0bccec37d/lomitutunamuze.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/97776e39db1aa0a2a5b96e0d052c5489/zimeso.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/nufulawawijixi.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090c704173dd---zutuwedufozutoziwojubulu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/vazadodumimamadu.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910d06f004---38584463313.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/11765189385.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32d89e592---44086243789.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c257754aff6---49929618177.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/doxotija.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/341ff755ba92af38cd5635407fad005a/lujasedoxabati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rotary+compressor+working+pdfPDF 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_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 16352 bytes
SHA-256: bb51fcbaf0f5f6693abdc3a965ee5dd79241f39a827ec88131e4e69f05e821d7
font_02_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 11256 bytes
SHA-256: cdaf1854b0633521645f3299f2e7dabcd1fa4d3ed953dcc93911782a95cd64e5

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