Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63c9cee24be888b…

MALICIOUS

PDF

79.3 KB Created: 2021-07-05 04:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f4d97ad913deabdfec877877a68243d SHA-1: 650c22e65d01b6c0e452b95f61b00f0928e6d0e4 SHA-256: b63c9cee24be888b1eecf0966d7277e68f8c10c27ad6c844763e28cc798e42f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882eace3a42---52324764750.pdf In PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/b83f08ca8b86872903c339811df546ee/8803449596.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb89cdb89d---kafimerikade.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/f0s2bgacru38lcv0b0i69q1jki/23260895349.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0b8a30820d1ac0c355d62f33c60c1314/resizapedivojikekufatet.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/lapuridobosivinefapidef.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/vafegegigufudifa.pdfIn PDF document text
    • https://europartner2.pl/uploads/56565758056.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/46856307436.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/22632724705.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5abb8a5cf---vubabefudoxekepoxekela.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b56961301ee---3392685851.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb82e95439---guguliminuxosuwunopusuw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160be86597cfbe---godorolexojezolonibu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609761ebb5be5---kuvogarepozinagoxunefawu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7418fbe2e5---71737135062.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12b1b610c---jikujomixijunusidodul.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/17983616308.pdfIn PDF document text
    • http://brukbet.com/user_images/file/98218815039.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608572e77e294---sikezuliguwususopowemewud.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hds90p6h3m0nn85l9tp41vbbq1/45042702189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=funny+baby+picturesPDF 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_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 17192 bytes
SHA-256: f23e32f879f39e98db25e0f774e4bb185c1dd6ab9cb3d6f3d34c8483a20ffa50
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 10532 bytes
SHA-256: 1b21cd7c5e34f26659216f9480c6503699287dec0d7e3b46ac80728cb39f46e9

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