Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2fac00622b2b0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 21:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab59a6b4542a9b2d14b83b96605deb51 SHA-1: 831b92b28c14a2cd328301a30b0e2c4fa27a70d7 SHA-256: a4c2fac00622b2b0bcecbcdd40e50c499914aec43cd7bc3edb7a8452d9dd19b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://huntic.ru/uplcv?utm_term=code+of+conduct+2019+pdf PDF link annotation
    • http://tnetimes.kr/upload/file///legenokivexitubura.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af6efcf3706---28198747973.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/72992928582.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1e5dffe0---pijiviboxabisojibuziv.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/musujuronamodurirup.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608def5665ac6---35957577816.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/89674084996.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565b185439---sipibezelapigalukiva.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210626084627855.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a35ba455c---sudelisasefarawuvija.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/71142465165.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/42122456925.pdfIn PDF document text
    • https://kultmotor.hu/images/files/pozisu.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/10474597342.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/gakokaberowuxobap.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/21178562041.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a807810a577---2773021743.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794553bf7ae---nugotuleji.pdfIn PDF document text
    • https://labelmarket.eu/data/file/vewesobezi.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/52425228375.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210625191306.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/57211212108.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916dd55b39b---29904389070.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/94377231678.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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 15648 bytes
SHA-256: 44853247250b70f1eadf14caf8db77a09f957ea203eb02d89fab65a74711e253
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 10640 bytes
SHA-256: 16cfbef262841d569b54a8d61febe9498a7d6ce91ddd9e385867d7dffd4ca2bc

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