Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d9fd38d0cf7043…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 20:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9e2e59db6f7070352698303e4de9694 SHA-1: ba38827bfb9c8927b5216ae5347a99411010f0e9 SHA-256: 16d9fd38d0cf7043162799712b998e19fac237431e6a72e57758e1a844f1948e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are compromised WordPress sites or disposable hosting. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext. Although no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://tenshinorchids.com/FCKeditor_upload/file/fonoja.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2c1dd01f8960eb274eb937b0c256fe19/98955355104.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d80suqa7s3728fgbn8a1im0ddp/6666281954.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880f561ec---jebew.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7dd4a00de798cfa3c6bbfda3619faabd/guzoxifimofuxenalawelogev.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4557145.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/tuwaminetalifen.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4ae1700ac79199450069b4bbeebb6dc5/pazagaxepos.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba3c89d05---32765812271.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e4f02e30---79887306821.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/zilamubemaretewa.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/8339353358.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mq7r7be78sa2ekgutdbcperain/76604501054.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5fa5a89725d5d9fd125b0aa185004fe3/tozonove.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052602521573499.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/q8ojvo6d9ahplauritbatlnr3b/tafopojote.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/58874463218.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/28047358552.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/xakomoniniforolaxazekebul.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ccngu52qpfa9uk193bvjif9h1l/wujodenelezurawavexaravav.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/22f9cad03fbccca559a42374daffd658/44088448231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=advantages+and+disadvantages+of+technology+ielts+essayPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/99051116484.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_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 10816 bytes
SHA-256: 607b37cde82a8430c6127afe75d6b16a8d881e68f5b982ced191be4000320c15
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 15572 bytes
SHA-256: 8dac4ac84a0230288cbb7581a540bb4ca11af816036817eda361a7a31289a520

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