Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a681a6c0547e40c…

MALICIOUS

PDF

100.4 KB Created: 2021-07-26 15:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03939a8dd0dd143b9bfda7acb2dab481 SHA-1: 9ec8a1592c30e36cc46dc9b9e6b67a80ac3af0a1 SHA-256: 5a681a6c0547e40c6b322842cab2f2d516c851bd2aacc5a142fca67313e00382
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, including WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://icltindia.in/userfiles/file/megibesapagedetawuvefo.pdf In PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/kikorasujuxi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7cb649143---36282703057.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab0e206fb---20118583753.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6651528fd---61952161264.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/86598204723.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce6e85cad---75081856741.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad5753e734---5181156716.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79329b861c---tovenaluzukotomenimuzita.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/bm55jdfvjfp767khnjsvecejjr/34438751567.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210615184428_1673222452.pdfIn PDF document text
    • http://zxsolar.com/d/files/92041389183.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1d05c2e32efe8e00d1a5386c940a6a63/23787564896.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/jegoduxakalepedobu.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/36633664764.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f7af796546a843cd364031b044a5f170/gifesebamixi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd9a491e57---32937018339.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/3936293452.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/nogadutu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade495648---kukotibexawejejo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2b9p2nuhe1k8r55f9snr1ql2r9/xigikesewefexosakosajas.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1451c7dde---67156400694.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fupolusemob.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e76d8d22e---nugik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=weekly+employee+timesheet+excel+templatesPDF 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_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 10736 bytes
SHA-256: da537040f0ae9545a11efbb214a65324d07132a5f552595e8a9406e0bd986fa2
font_01_sfnt_off00013d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 17300 bytes
SHA-256: 7c8d2133c783c38307f932c39e0ad301d35c51f9aef268a807ec86d371a942f7
font_02_sfnt_off00016af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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