Malicious PDF — malware analysis report

Static analysis result for SHA-256 f242b179ea9c6cb6…

MALICIOUS

PDF

74.3 KB Created: 2021-08-31 23:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 72ef69615ce58bdef4c83f35f676e65e SHA-1: 4ece9f19a4af72680a26ce56606263cb6f39401e SHA-256: f242b179ea9c6cb6fc867561597f66c59eb2b2b252806596b5d4ee6b99fd5705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://saothienemb.com/uploads/images/files/muravisarivojutap.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bb9a16fa---wuraxowosapexo.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/ziforebipujerevo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/172700bc4f819f5f9d22b652e4789f8a/30229142429.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4662e96b3f99caee2ba7c027856656a4/foginexuxojufagakoti.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db65ec1616---sitosifiwijuxuleloro.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/96595675221.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/5897885640.pdfIn PDF document text
    • https://dpmceramiche.it/file/jimeludunididolame.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ff9ecf1f4efab3933d5c4b80b91c681f/99350797827.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/rabubokipo.pdfIn PDF document text
    • http://nfc.soo.jp/file/fekififalad.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fea7e302---buvilodum.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-19/20210719034909704653.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9c7b0746ec4dbb1e943cd0165e909e29/povovopujiriwug.pdfIn PDF document text
    • https://aspirans.com/files/file/logavitofeg.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20d508be2---budinaluzid.pdfIn PDF document text
    • http://www.puhito.hu/uploads/pemodepefunilepapimigoze.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/40153986175.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/18017504018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=types+of+flagella+in+bacteriaPDF 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_off0000bf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF64 16728 bytes
SHA-256: 4e48e02f8072f93db69b15774a21dc3a3aa5036017a0a2246963f9ec6066fa53
font_01_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 10872 bytes
SHA-256: a9745a1c76ed7641180f895c7e71e09923015b212d6cf79ffba9547846561246
font_02_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1