Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4ddf1c0021dd24…

MALICIOUS

PDF

122.1 KB Created: 2021-07-08 03:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e16cd9cadab9f8924fd127d42d0b4ff1 SHA-1: 71ca5b740f9a2c913809416a4d7d7672a9c91962 SHA-256: cd4ddf1c0021dd2408bd7c9a5bdfcfb87b96f3b7dfaf99e51ed5d3400fe59d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to various URLs hosted on compromised CMS uploads and disposable domains, likely to facilitate further exploitation or phishing. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160945ada3c4d7---dutodonifasa.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2d1d7d1dee3756098d96a7189355becc/jazimuzixageged.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b508799c9ce---32194971359.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/23087150793.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd61947f4f---lewebiwegagotedupa.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/84121263919.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091de5962d77---60004949297.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/rc6j02fe10f1pisqicu7487f64/jugosagitetog.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/13591043783.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/48554687610.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce219ead20a---wepukuvifuwopiti.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mapejajigikogudukab.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/feduluwijisimenamajobuxun.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cmq4701ea0hulgveuq074icgv4/66269137647.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/41050bb30545373a5cda7fd28d6d8586/guxixadiwemogevej.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/7b9677482085f9780c188101f7e05fd4/47129059473.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/84e18a117a94373df057d43c2e1cd6ab/pigixigesufo.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/99644658425.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2bdd406fc648a08c0846fb6bb3138dc5/jipak.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/vereperimalenaluw.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82acd6a456---nudebam.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b9730a72---69074192414.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a491f9c34cd---45911149531.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/75834523235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=thomas+anders+one+more+chancePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000159cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CF 9760 bytes
SHA-256: 448034dd4a6b2a52f21ecd42406773394dc4feb669f60661c7f84850b4e8ede7
font_02_sfnt_off0001793f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1793F 10360 bytes
SHA-256: 3a27e8dc70a913e85aaff5d9af39d5d6753de5401a0ce50f979c537f3df3525e
font_03_sfnt_off00019070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19070 19888 bytes
SHA-256: 1477c4093289d216789e0b60bf9a2caf4eda4633e516b01eeccfe694c49144a1
font_04_sfnt_off0001c27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C27B 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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