Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8979e6ffa03bc9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 04:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7e29a58bc00d1edf05dfbcf7d1c30b0 SHA-1: bd2443f8a9c0e6c282cb406ee6e362503c729fc2 SHA-256: 0b8979e6ffa03bc91e4eac28bccd22aa14a9f22baaefd5336a21d9fbea5d23a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The 'SE_QR_LURE' heuristic indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=how+to+use+android+phone+to+scan+qr+code PDF link annotation
    • https://aykutemlak.com/upload/ckfinder/files/menubesinadi.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/95541866103.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/watajusuniguwala.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wixupaxuwe.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wovevovaguvirimem.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_AE912B621700115F.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/pumexinivuvuzofazikam.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae430d794---86809298307.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/sagola.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/84611420038.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/fufadux.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/43022427169.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069f1c32ed---lawufezagulixazagesipixis.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/vozovavuzivozel.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/gofikafozune.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8efa5737---17747057921.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qqcij2ck0v88i5b61tmgltbsc4/57876249951.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/guzosubapejeji.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/xenibubejijasenakunuki.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/80765525295.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/33056894373.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/25385718a1591ecffa9a83405804ac25/8753447308.pdfIn PDF document text
    • http://synfarm.com/upload/files/gewojiluzelepetumiwige.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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 10888 bytes
SHA-256: 1d71737e3c76a4d00a4cc35e78c119d645583af669475922e69de5a5f1dbd9e6
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 18136 bytes
SHA-256: 7bbfb91ffd1d5ec8da51dd5426a538767aab48e88b7228a56b35e1666ad1ce80
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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