Malicious PDF — malware analysis report

Static analysis result for SHA-256 a643bd2530b33a0b…

MALICIOUS

PDF

88.8 KB Created: 2021-08-03 04:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8e74f50b2dc0b41d5fe91fb20394d021 SHA-1: a8551d45482cd488535c823291bd6917de846852 SHA-256: a643bd2530b33a0be781f4cd34a5c42206542bf274b534162b81e4c0032050e2
196 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 0.9990

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://purmoradiatoriai.lt/images/files/82769346909.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe8285b72a---bipuworepufilijid.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9257a7bb319da065b3c796a1321785a4/mipigoxirilomunomomefoj.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160821dd41a854---35083038655.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/zajuwuzirazodejorin.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7h2qijlq4m70r6r1iafi3b03bd/fawogijatibur.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3063ee20e---wamijadokenonabagizu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b15a5775---tagek.pdfIn PDF document text
    • http://vlajamo.cz/images/file/dawumajuruxefapoxifuwek.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rc4e1r36c6biikvgkj1klpdjt8/baxifo.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/rilobopan.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c6f90e798ed67b715a8cdd92adcb1602/vepogidulutakodefovugemuf.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/zesogatizozafapumudoxodi.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/73720130724.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/32bb922a32464c07342d261aa0d3a74b/pusaxutogeledirigovo.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/muzonuxag.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c293f0c22---bojukowokowilozedamab.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/8407617631.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e83a61e6---69968740622.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/89040522888.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1jclbru3oacsvbcgfcj7bb0v57/64584727268.pdfIn PDF document text
    • http://schokobrunnen.com/idata/livafemasinolovugo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/03453fc19e97c2a0d3275611dcbba310/xiribezedofipavite.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/47469359326.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/47bc34917d70f1cfb117b88e82641118/34333634094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=que+es+bienestar+y+sentido+de+comunidadPDF 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_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10896 bytes
SHA-256: 1d9d028cb5683d3392953089b15e20245d15849323fd8b8abd8b9519dbe53c65
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 17236 bytes
SHA-256: 36e8cb492272b1a828040753eb225e027407909a03339170ae66adcc47ef9569

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