Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1cdc35357f8859…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 16:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9a1cecc370ee336d7eb124921881abc SHA-1: 00235b64a69a26468739f845c8c64e6b552b2dd8 SHA-256: 7a1cdc35357f8859f390a2ee71f9cada738e1a5913bda49cba0532174474f6bc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing a fake browser update or extension, a common tactic for credential harvesting or malware delivery. Multiple URLs point to compromised CMS uploads and link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1ce7fd93ee34872bbe5283a047fbe9/56926796983.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/40f639030ff166cf587213ef52d257f8/limozaxo.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/6938677575.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2cdc5d441d9d591ec1bb1f46ee8ef292/pezavowatanoxa.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/70001235365.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/09a3c9f3cf098f747cc646404ba4f89a/suluvozetevuvewife.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/vigofusibagunurov.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a3e40a49b111e3f951dc0e71193c9b23/40340887705.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/6eabdeff13bb365d85619d18d49f6fdf/gupax.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/4203728183.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/tafopotasorudin.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/tawinep.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160843742498cd---61816850519.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/giwoxifesekanixel.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/14716015253.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e769e2e066---46026519913.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/50916209420.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9aea54ade99f75f5b35b7603e0c28e07/99325276830.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/97595648023.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684af78cdb---timevinifewajotirajonu.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/luvokamidubozakoluba.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bibijuxiwuzaxawatizoxujid.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/zubebagodinopojowosomalep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fatigue+analysis+in+abaqus+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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 10932 bytes
SHA-256: eeaf6db7e56401f04535cc1b51eeff7dad25e578d78d5ee1026d671469768664
font_02_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 18480 bytes
SHA-256: 69a1a87960eabac3d5f09faf265792f6237f7dc270387b5678a1eee6525ffe37

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