Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e544c3d30b251d7…

MALICIOUS

PDF

87.4 KB Created: 2021-07-16 06:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f259141cc1d1ad22fb0184a927be943c SHA-1: 3d4048d1c25c98914d4a0fa7b9abf5a64f0f8366 SHA-256: 6e544c3d30b251d7f3aace7a1fb7f0fb7c31df1fbf3085baf352319ad4ef54fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d3a7dbe9e7983650c429a4e47c27a791/62982021455.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sifegifokukozumixe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/577a82dd40fc1f63840c58a342f0d939/ditudefodudirawapibagen.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/87786797301.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/638eef9b374d341f2761ca1cefd20f63/76617548271.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xerejuw.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7264a70c---vimosupefezasozunu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085cfbd40231---81730473057.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/puboneferareriv.pdfIn PDF document text
    • https://2acontractor.it/images/file/mejesorabot.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bijolajurudu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t35aln6a74rdddm26pnc76j2nc/12253408344.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/20180763178.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/buvobixe.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a9fbdc0d---lunuguxojimenoge.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210703_47B21F36BBF0F224.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7794d13618---58942821838.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45883583921.pdfIn PDF document text
    • https://luminex.pl/upload/file/81239416235.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160858a43c9055---bevuv.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/befapemigufani.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/53566245570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=write+a+letter+to+your+father+asking+permission+for+school+tripPDF 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_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 16436 bytes
SHA-256: de749f0bbc6c27358d62a8f711f1cfb4f23d7d81de78f6130b31b7c1940b585d
font_01_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 11224 bytes
SHA-256: b8b61ab21c5e06b9d79388042d36daac9cccf4778ada382a9e1dfe211f422335

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