Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93f4a7e2bada474…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 16:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93a354df986cb54986f361f73f13da64 SHA-1: 517a97917c6dee00bfbe8cabef5bf3bdfb372ab1 SHA-256: f93f4a7e2bada474fd4f599f035d85bb50c31228f8232a1c3cddccb27e702563
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, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://huntic.ru/uplcv?utm_term=samsung+galaxy+s20+fe+vs+iphone+12+pro+max PDF link annotation
    • https://onsale.social-push.cc/data/fckeditor/files/27383178725.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/pivoxujitemera.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/31274699580.pdfIn PDF document text
    • http://ruihuitax.com/files/file/70764151259.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/buzibovelabinujeganikugi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161417255b5fb0---dabogerin.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe55a214e---77628192121.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/18102518472.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pasufutenubaxuxemefi.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/71023320774.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/13935617504.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/40344239151.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/79118621660.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613561d24c37a---18802844938.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/1582817079.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/553f286887cf21aa02585e6845674eb3/teliwinuvoluragibibumit.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/ziputiturawasuxes.pdfIn PDF document text
    • http://skolky.info/foto/images/file/mevarexofodafojin.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/bawipitim.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/dijenivizetisela.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/nafewokalom.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/junitos.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210914100917.pdfIn PDF document text
    • http://annabarons.com/files/files/nafofofejapa.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9c428f9b297fd6ba9defe0a73595c246/96975549445.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/22501915459.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_off0000c560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC560 19280 bytes
SHA-256: 9a97b0612e52dffe05965d27812b5062b7f20917cde4047cf82349da27eafe3b
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 11456 bytes
SHA-256: 2e584dc406438a0742ea8524c8e8e22a048722147e76831d8c8962c3fe01526a
font_02_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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