Malicious PDF — malware analysis report

Static analysis result for SHA-256 743a0aaff1a2ec71…

MALICIOUS

PDF

97.6 KB Created: 2021-07-13 23:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: da078f5911ddc5156399245a17245b7e SHA-1: f35d73f61395f99a57242c01e231c70b8ae66b4a SHA-256: 743a0aaff1a2ec716965a34ca00a58563ddd4b202a30b92f2cf22db0dd3c070f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous unknown URLs associated with compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ceb2ac90e---93772037441.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16080a77be625e---tadakib.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/15030369197.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27a0c73c9---jizobowavofasupadu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/sakogovirijovijep.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/17961967212.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/44723234374.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607037fc4d559---falujatemokonafododupu.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/53353742063.pdfIn PDF document text
    • https://tipresentoio.it/images/file/boboputaziwopukajide.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a1a2a4e40---dapevujajuf.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0de8a0cb74fd21bcbad800670ec06f89/gukipajupufejoteranajilen.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3bui8mpqp4r138b3j2742qss55/tomosixixedikel.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b856c755f---95811900702.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rixakirezaresesi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fa582f04---31777121603.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nabowutisujamiruda.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/145fb5cc0b4e3e14b1e5c4176dac8fe2/zumotirupenevoxu.pdfIn PDF document text
    • http://landpas.pl/upload/file/pupuvejirutasag.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/60388usujd2feoiu5jkfmhuggv/menabemijozofaxezetidili.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/71827177167.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/sulefupel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=shih+tzu+with+tongue+outPDF 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_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13573 10232 bytes
SHA-256: c9998171b86590773d76ec91ec099092bc9856e8b4e8abfae02865e695b2c7be
font_02_sfnt_off00014c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C80 17104 bytes
SHA-256: 04808b5934d99ff32356cb30445536b34c26a4fe5a799945aa40dff48345ad65

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