Malicious PDF — malware analysis report

Static analysis result for SHA-256 b622018f2504a440…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 11:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 073fbfc091e321819fec773aa38ffc9c SHA-1: 8d219c690358c60cc1513b597620a4a3c146ef87 SHA-256: b622018f2504a440f640bcfb5900d35a55bc6cf72b905e34be47e5be6f0bfc12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of these links suggests an attempt to lure users into clicking them, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://finproekt-msk.ru/userfiles/file/72575592101.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/0207490a948df6ba120eaea093354c23/94590401575.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612b504c2f2b2---gabigazomosuzutafubiw.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609075693f2d2---89809492856.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/vixuxosoxaboxitamojagej.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/a82efp2u7b204lj3ar43892v75/xalesavexivolabevonus.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/wuxuwepubatokuxuba.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kojoxujubuwoxivu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d9b5b24bc---17402481554.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/tirorexapazorijupepu.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/8103708495.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4f8a886bdfd90182345a1e060d6a2fcd/45398173843.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/71928897587.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07f64d30ea---12825670120.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/memazajodireno.pdfIn PDF document text
    • http://esistore.de/userfiles/file/20412243955.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/31577432864.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/79031849384.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/mavomezedivugalibowux.pdfIn PDF document text
    • http://nova-auto.com/upload/fuwexelax.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/veganofulu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/24938454616.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161069b983cd7d---84337185007.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e20200ce5f79f8a8447be0e9f3ef3cd3/niwiguremiranevefexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sequence+worksheet+grade+10PDF 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_off0000bb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 16600 bytes
SHA-256: b7de74d69143da1d480334975cc136e3fdbc899146adcf6f7ee89a49c925f8f4
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 11184 bytes
SHA-256: 09f042a6286e8512a78a812907743cc1c7a543ae4c7e6beb73b5dac6a420c7d2
font_02_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1