Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c535f408037950…

MALICIOUS

PDF

82.3 KB Created: 2021-06-30 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95e21a04d8fba04db95ade6267051846 SHA-1: fdb060acb55335d9d4aeba7fd5c235bf77ed3b6f SHA-256: b2c535f408037950c1ee3a1c67d3a92e9ddfa8d57e25ca6ae1867cb8debeb009
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts hosting similar content suggests a coordinated effort to distribute malicious files. The primary goal appears to be directing users to these compromised sites to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • 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.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3985c9885---7574343110.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/30b986bab3c596da1598ac66407eadc5/vetodolemane.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5dbcofnnlholdlblco4f8103bc/39413661767.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/keven.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c9708ae1805---nobul.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/at8l2fmfkbr0keffi07f7qdeqm/89152263418.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38f5cb19a8---ladajoxiparoso.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c744993398---lobuwusogojemilos.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/40400430419.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/susiwozumijolidusiz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fm3uutilnibfq5jar94ig1en0p/laxipazanobelir.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4p961lo22l3mbbmiauc16i1seu/56859242077.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/nelepebezojasone.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160925cd087e04---4141175809.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/dj0743aqo1npuahvamq3lig1u0/pubuveladevupajamul.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/aoaiq982071h7lcv2vcl7rvf8r/pabixoneveze.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/27400653914.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8qtgqig5qskrb2pfr0aja2rd03/bewuvis.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/06f32bf3a7d2c65ac2c4638dc8eeabd4/33713052234.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/vibowonerupokujaxiboburaw.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c591124eebd---24424841979.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8c8d0b64---fenekixisupedosezatasebu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/v7dt71ib4tda9uu6ibda7l11dn/nibozoroguwevoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mr+walton+please+control+your+love+novel+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 17408 bytes
SHA-256: ba7f56c04ff1802f6f6cb743fd1ae9d6c47647f33a57fe8a27b325f1c81a8093
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 1984 bytes
SHA-256: 58315584a32a2c83460e3af3f630c2e688bce297d1518c8f9e46aded1dc3caf9
font_03_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 10880 bytes
SHA-256: 89c2e6c5bd6e7883596b9b434ba696ed130c634faabb57ec6385c65b4f160b12

Open this report in the interactive analyzer, or submit your own file for analysis.