Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ec48de7caa57ae…

MALICIOUS

PDF

82.1 KB Created: 2021-10-07 10:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 027a3482dd59621504a63bb73d570be0 SHA-1: 1748c0af98e835f208db037d09bbb9661731ecfe SHA-256: 28ec48de7caa57ae4bf53eecf4e0fbe18d0c68175633c17448365a063ccea46a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to phishing or malicious sites. The PDF structure and embedded URIs are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=burnt+oesophagus+from+hot+food PDF link annotation
    • http://custom-mugs-factory.com/uploadfile/files/26399548397.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161482c45576f0---77507446982.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/tapirogude.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/50730711536.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/674274366.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/lixaxewakadori.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/ruzawabixelavijuze.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/24500f78e71f89583cdb19cd9285a316/volid.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1615c22679eba1---42898060083.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/6748890796.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/69911905293.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/13769590606.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/20632565770.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/16765379989.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/36746791274.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/kozenumovasuwuzor.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/mexazakogaduletiteruw.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/ledodojoninifugitodub.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614559b555c48---fozilowuroxuva.pdfIn PDF document text
    • http://186086.com/upload/files/tozera.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/81026180620.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614921160d892---kujirolutulafawadevun.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/jorobivapexekite.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/59873371556.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 10960 bytes
SHA-256: dedef97df144da5749e276e6071bce64b916b40318797a381633ada151844530
font_02_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 17376 bytes
SHA-256: 045d124d73f862e84e798b7d1362514d82c7f99624f0beef508cbb34e2c8da35

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