Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e04def9dea5a5d6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 23:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 78b9b17097675275314447769a50e629 SHA-1: 7d1f03be9f315668f58bca52bedde656775afa7b SHA-256: 7e04def9dea5a5d6d525578999ed000ed4bd513626dffa9357e70a2ba205f7f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://apcmagon.com/userfiles/bebiruzofabubanoxo.pdf In PDF document text
    • http://kelvista.lt/images/files/12866381824.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/96353113129.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/losofobaru.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/lufabivujakiboganowipek.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/gazuzotixubiwulo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ac7bc90da436965debf2e1c019cc4152/rajegibituzoti.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/57956566000.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875944930cb---porimi.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051920200410.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/narenatemilotitewubew.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/97e286c74671ec84c1627d7e31785b68/janifusexinodufigirone.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/gupiv.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cfa565a1---xezubidepuxuwapafop.pdfIn PDF document text
    • http://expresskaliski.info/file/52609943087.pdfIn PDF document text
    • http://vtaky.sk/media/file/megedudanajudugab.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/wufokukulosivevosa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac56a30a2---nikesafewigapowa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5c206900---40726527699.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/44757189977.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1acqe2bu8utatrq1k7amufbpl7/kukujazimanorisug.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/kewim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wwise+101+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 18488 bytes
SHA-256: a0208f53733b3abae82cd4464e0437d7869cf1943079340df32cb16b3ecf998c
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 10116 bytes
SHA-256: 056867a47a317e148e1dbe293f903f2f6943060bfcd50a2cb128c8db305ff91c
font_03_sfnt_off00013704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13704 2012 bytes
SHA-256: 7f9fe78eb73d0916ccb38a55e8ead055b16f743b3e85accec3c7f2b2e4c43b1c