Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc88f836236bd92c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-15 12:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4012d32d22ed9fd96484f4dad174945 SHA-1: e21025b0bcbc1f88827e842fb4c9b7b51a9fa5a8 SHA-256: bc88f836236bd92ccd59506631fc2034b28ee6c1f1a234d4f62d35cf88120473
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb1109507---sufodibipuxupugevumiw.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/nubodadoxag.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/23278754681.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4960e80cab4265ea9b6f859c5e00f3a0/wegimozukuwalutuxizevuk.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/39915856547.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/perorom.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/putifudag.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44886380391.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7ffc83e8---poguxola.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/80311874952.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/fevuwavenerajivuva.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/59437494950.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912020106933186.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136037387795---xoweredusijijuf.pdfIn PDF document text
    • http://boldogelet.hu/media/jebowafazemibareta.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613240ded69be---fagovaditi.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/18459675372.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613822297d017---xidivitatosowuwot.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/40225482991.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/18364498939.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/65062969808.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/58864260615.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/80551915571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=work+out+quadratic+equationsPDF 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_off0000b857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB857 14820 bytes
SHA-256: ad4dc54f69ca5442487df42aa09e9f9ff67eed561a1a1e1b78a55e135b26c85b
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 10648 bytes
SHA-256: 1498ee1086667355320dc40454676c29b7093417adc030db5f55c6da95d8863b

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