Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbba93d82db2f5a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-07 01:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f769dd3b1cb8034babf19b9bd1d77edf SHA-1: 32dfbde70d3cdaac61cc4535dc31adcc3cdbe596 SHA-256: 9fbba93d82db2f5abad15ea40fa2f1742c0be6a6579b390f647934e392bda9e9
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 ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple links on disposable or compromised hosting indicates a deliberate effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e596b6dcbe2---nanepuwafakulo.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gjkfu55q4dta5gj4udc00qubk0/24983840215.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/turalebuven.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/83566887155.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/355f53e5d6c98c0eadf57839db01fc1d/bogamixitilozofidurase.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/30976226515.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/junopasifezavenuze.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e40c1aca541a972bbc30023c8ef07904/magikezejikorefofowevefe.pdfIn PDF document text
    • http://exima.kr/userData/board/file/tivegonuxaregofopotu.pdfIn PDF document text
    • https://grandstone-egypt.com/userfiles/file/3734308226.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608700ab5df75---sujiwitogudado.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610a595420ff6---11907039862.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c0fa87a630e73b2c6c2a1afb65ad25a1/54394077193.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6e34c382---71884111054.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/45310235869.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/96663650853.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/tesuzijun.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/63fad5f7b5f1ab101bab35f3d2565034/9107193664.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210715164514401.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d1f6c36c---94468634585.pdfIn PDF document text
    • https://artenika.pl/fck/file/12777533057.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/wetegazorolivadutibogoduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=winnie+the+pooh+happy+new+year+picturesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e52a54f2---kitusapaxupu.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_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 10716 bytes
SHA-256: 4f89a0ee3217b3072252bd3e64c5df0d5da7a84b463cb85bcb013e27792d99a0
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 17176 bytes
SHA-256: 2ba34025b5a2a68480a2b8856da05c476768b74369b53911f10b0d1bb871898c
font_02_sfnt_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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