Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9579fab496e419…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 10:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c37a1a4b8c49038c984e5f22504aad05 SHA-1: b8c8e4582e76671a0d238b02774dbd21b1ba2ca9 SHA-256: 7c9579fab496e419dff0dde53455dcd46d0051e9c6b8cfa6c553f74f203ec613
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing malicious links and being part of a link farm hosted on potentially compromised CMS uploads. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs point to various domains, many of which are associated with compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c8d1e861e---xexigedodefizafosaz.pdf PDF link annotation
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/982c9ca346c507e0e1c35d5666e84046/mupikafonanufapasikij.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d61e2083f8d5b930acae19fff05fba12/99019939662.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfc01f85d---buvagexadakerereze.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210513220846.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6r2l3a2ldaer6i3hhj08ilurg6/nuxara.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/tekaxigubirinelebiziditon.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2735c2673---42658277737.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d3c858ad---salomijijolikawadobi.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/kijinona.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/54d370b77bc1b5ab5afac69966e8eca9/38235625185.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f7b9e9ca3---dikufulojudogadoroxumexit.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161330428e6644---jajoberirokeruzuvo.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zazudasedevixasivujux.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/78695999794.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fudevoxigam.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/duafh2vng1elsmhbb0fa0rrt6f/58321451211.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/tumoboxaruvofavukujarib.pdfIn PDF document text
    • https://stopserv.ru/files/file/fasudorekamulikopalezik.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/dukiva.pdfIn PDF document text
    • http://sksound.com/userfiles/file/10364731922.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/9822260279.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/13077073391.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zazivewodot.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161076707f2f75---xoxuwumalunakelobotof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sumerian+art+pdfPDF 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_off0000c2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10500 bytes
SHA-256: 5c9814f89ea9bb62970e259055b2e73be08e3099408e9192be2e16153a89295f
font_02_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 16192 bytes
SHA-256: c5090f9904707cc3ce180b9dbac442233ce6b9241226dfe2cc11aaf60930643b

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