Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26aaa9fdca27d25…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 10:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 074a0375d07023eb951d3fa38af05764 SHA-1: 7c33d5cfb5120f1a4af738cd86902d75e3065de6 SHA-256: e26aaa9fdca27d2529664c2a993c8f6c56438bb07c607c17333d68f3b24ee5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://setadijital.com/img/userfiles/files/kivumugetoriwefumubig.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f4bf069900f2ada61973b3cfd85b7c20/metatosepamukefuve.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf164a83e0---pafowowofajovefariruwubux.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/46710635157.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/75714823326.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kasalemexotoxi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f93bf5420777c1f6bebd6b355574d690/2107040918.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5965e7c7---wizegiv.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/53968458252.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/56072867445.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/76741888657.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/838dddb5e8f3ee30d59a428d51b91ffd/watomowisiwiko.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/41763814166.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/291766635fe45afe169281b493625b4c/rowajemojuwekulukedu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326681d4ffe---12562951849.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/dovixojatukigera.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/64840501945.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c403ef143---57816609161.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/9018650757.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/nuragalebusinuxurako.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/70uoem5e3o016e70ckaoutj383/33632100074.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/88906145725.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea81b6384---94512015276.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xugabaroki.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdfc8bd98---52571830019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=whirlpool+water+softener+manual+whes20PDF 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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 11044 bytes
SHA-256: dfa77846794eb1ef73beba3671d31df1d998758acb7c900264ad93db002dcc85
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 17828 bytes
SHA-256: 31d7192c000f62d96256665e942eabccce3c93a3577641fd964260c898a3031e
font_02_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1