Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b81e27330c4267a…

MALICIOUS

PDF

100.9 KB Created: 2021-07-08 01:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8266a68291b285fb451e06cb3b1ab98 SHA-1: f6ca872d20b395dac827d9ebdbcf363d36660c89 SHA-256: 0b81e27330c4267a1c1d99dd4fe4ab84b690bc91eaa3110d238ca6a22de96de5
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, many pointing to compromised CMS upload directories. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://vitalenzyme.com/uploads/fckupload/file/52016416593.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7fd297bd7a61b3609072ad09260a98c8/52710054141.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/25520609724.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160917e05388ba---88855981438.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/da3efa345e31a32817e445c33fee527c/towuzusokek.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9667e19844---50388833681.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5cd7eb9f0ba1ff9ba225f5158816bce0/27057851230.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/297bfc20c506ed699037055d97bc3f2a/79058645671.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736010ba751---15946082125.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975782bc33d---2634473042.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5272f1bcf---37084218262.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160885ef3b415d---woxonefigemagu.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/roses.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/30341831317.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/98d7d0d4f9f18190305266cca6829193/vojegekowe.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/82716589537.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050407001692.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jolut.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/opdgdo216521fbtf1araj9tjft/45349599623.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/56617192087.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec94a27619---dajuvazub.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abbf30aa50---6345553787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hdlc+full+form+in+computerPDF 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_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 10544 bytes
SHA-256: 52e3dc7a50423b8bf2fd96117759e2edcb15e27e7e2af655a640313f173ea5f1
font_02_sfnt_off00015a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A04 17152 bytes
SHA-256: f718cf50b432ef1d464f7ae4a4087304df0e63999380c05a80b22050385c8211

Open this report in the interactive analyzer, or submit your own file for analysis.