Malicious PDF — malware analysis report

Static analysis result for SHA-256 af55a9dcce6c0aaf…

MALICIOUS

PDF

113.5 KB Created: 2021-08-07 14:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02bb73240fad0497762d4b20c006149a SHA-1: 2921a4ff7b3e118d7a09b08f05d28cfe51de0372 SHA-256: af55a9dcce6c0aaf48dd3c6d53fe75549614903c56879e09e8dd8149d1aed5bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9799

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb259a79b0---sekolaxerofolugijabokamu.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3d8b2600---gelibarejapefini.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/bevasefufizajifupi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf903d2903b---bisidozoto.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/71eca2e80a2b464f4340a96bcf7c984a/95190077460.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a06e80f21---81505106564.pdfIn PDF document text
    • http://dnepropress.net/files/file/zodajijorarutomeb.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c74984b49---88485020978.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0552696b7---bugixukogovaz.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/ximalodojijuturilog.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16236011843964.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b364562c29b---regulas.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c613a8930c5---63067390820.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/32a3d68946fdf93d450df40ccf225739/bakobamufirimoxofu.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xivoraruxugurikenefan.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b569711fe10---xilomedulaxagenixa.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/50429003716.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/zexikuwatopijifojixazib.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/6309836245.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/jixad.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5e6345b8a951ddde7c5f8159676518b3/jurodagefupowu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909926c7f2a---merozipunosirufuvima.pdfIn PDF document text
    • https://udruga-invalida.hr/files/vixaw.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106201449501945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=que+dieu+nous+preserve+en+arabePDF 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
stream_005_off00015dfa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15DFA 27068 bytes
SHA-256: 55f37cc8b98dbd090aa408afd24e6ca8535b7186946e7f18d4de6f346a94ed12
font_00_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 20364 bytes
SHA-256: 695f409c631359bf67a51c05f6d931e619aa19bd7406753a84ca0b486368090d
font_01_sfnt_off000145cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CB 10604 bytes
SHA-256: d7bc82cd63921f1be36b0fb66032ce0b7e0192b22e00de9ef8271da44cfc64da
font_03_sfnt_off000191dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9EA 2844 bytes
SHA-256: 9dbdca40fd53064eae234534777f2bd8accc5784cb68532dafdb7b801364f6f1

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