Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c1a1fac5934831…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 03:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7edd70b3067b24902da2f3655cc38238 SHA-1: 2f9d8e8d3e06ae4308d69984730c453c37a6e030 SHA-256: e5c1a1fac593483101f74d9ea2557668c09ad7e9fa47486973cbd740ca9c1561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://catamma.ru/uplcv?utm_term=hdfc+ergo+health+suraksha+silver+regain+pdf PDF link annotation
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/54398800905.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/50998772770.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/7028264070.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609450d8a20e6---51656331887.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/i9q9r58mhb4k0vi0ue979mhuhv/setapa.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/532b9a9cc5271da2efbdef651609de2b/zuxijuvuva.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608038780f2c2---88048321163.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3c045da02bbc4febc0bc5e3fffe54754/83942770316.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/nozonoxorugi.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/11609797989.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29cc3f284f---nudil.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xosapusizevepakuzinepo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e5305e8822a7c52af1e572a87617f3ff/66121082612.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a514cbce---felireko.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/53516092544.pdfIn PDF document text
    • https://nistd.in/userfiles/file/ropawojazubimebire.pdfIn PDF document text
    • https://bor-diing.com/upload/files/64839507549.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ud5eungn5m04li95hr4trfqg3h/bipapizusedidozitir.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/99660696403.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/lizedoxewusomonapujipanik.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6123ad38b50a099ccc56ba322391f185/68733478585.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/88891964530.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/18826831648.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kapusin.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/95522293267.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_off0000b49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 14840 bytes
SHA-256: a73fe9667299506fc1a1b83342c1c0270c73fb8e0baf26662c50c0caffdc04c8
font_01_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 11148 bytes
SHA-256: 5a1ead9c0f99f15d1d094d6247b825103910c358b1c7fda84d89ee6fd238475d
font_02_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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