Malicious PDF — malware analysis report

Static analysis result for SHA-256 433b3f6e549d7762…

MALICIOUS

PDF

93.9 KB Created: 2021-07-02 05:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 957c1abd01cc919a21edcc81081b457b SHA-1: 36d4add2c0a1b39ac4f47258f97567878fac428e SHA-256: 433b3f6e549d77628ffb164a5bc669133445a8d183ce644d7ddff485f02dea3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which appear to be hosted on compromised CMS platforms or disposable domains. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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 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://medvor.ru/uplcv?utm_term=the+railway+man+film+review PDF link annotation
    • http://elisa5888.com/shopadmin/upload/files/62001352659.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/vowesinebemula.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a36a23acf---jakitiwid.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zobijobasab.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0e29aab0---renugapofin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34cabb6ed---40575754391.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5237a8f8c2---futepulabura.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/wugazozomata.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/94465980150.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/prljk5jtk668pm6jeh5rp6kbp1/janumuseboxovarunafolu.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbdf676c5---31494086030.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/pugowonategadalovikofoje.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073562455d85---wusek.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d103ae940---19506210425.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/37382278259.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb3f6da42---43121609679.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/poe4kl7s1q5qstst701jm8vpp2/petavipadobuja.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/7118565550.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e811d428b9---tufawirafuwewowutiza.pdfIn PDF document text
    • http://www.bash.cl/media/file/91027623848.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06419d65d---pomajip.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/16405648170.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096aada2af64---xebotafurizokunobe.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5e1f568ff4a85a9b0d108a622bbedf8e/gabuwaviralefo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bea1da12---xomenafagexu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16740 bytes
SHA-256: a985e1deda0b7c292999aed1918b0bf1e049db5bb4fdc9343973e595c34b9a19
font_01_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 10320 bytes
SHA-256: 15c923fe4a0155136812e097d889fdce0ec597142d048d5cf9b8ddb63f92e67d
font_02_sfnt_off00013c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15457 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd