Malicious PDF — malware analysis report

Static analysis result for SHA-256 64af010cb9ee2658…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 16:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f8d2439282066d6c4764620e94e0c91 SHA-1: bd0ea55a48e5808ad2ee026a0835106f5f5352ff SHA-256: 64af010cb9ee265852bf6c8dc16ddde10b34e2251e1d0ab711d68e4cf0d928cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd640548b---33259265455.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161324b651eadd---63199676151.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/58504859739.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/tapamozubezutamilidasuxas.pdfIn PDF document text
    • http://dsraxys.com/uploads/94969030064.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ce92f753---53019676509.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/vubalexejodonuwexekotileg.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/besemebi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137108e6d507---71459745605.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161370ecbe0db4---40773873465.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nisunudizuda.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/fiberidi.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/95266731127.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/39394544346.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feda826c2e---furupizivuzumazegu.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/danemelosop.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jobinitofazamosodirogi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/80163149926.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/rupopa.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_BC7BA4291F5BD3D5.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ligerafimuto.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lelepevejivitenizibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+group+name+in+messenger+2021PDF 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_off0000b1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A3 16056 bytes
SHA-256: 6385261c44fd63f99cd140113710e73e6310c4e1315b6c2e0a6b896c8b7a9fa0
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 11244 bytes
SHA-256: c44dbe61c204d2bf966e1896ea97542609cca27ce18136c6ba0dd7073e847034

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