Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7277418dba3713d…

MALICIOUS

PDF

138.1 KB Created: 2021-09-07 23:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 753ba7d3b30a084c7b952f2dae68842c SHA-1: 46b5948fcceec9bef8509b4a15514f36ffa1abd4 SHA-256: b7277418dba3713d85cb3bf2182484d92710e9263e783392a595f62efb73be5e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the 'callback phishing phone lure' heuristic indicate an attempt to redirect users to malicious content or solicit information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=commentary+on+earnings+management+schipper+pdf PDF link annotation
    • https://bozoklar.org/ckfinder/userfiles/files/jeloba.pdfIn PDF document text
    • http://apsons.eu/files/file/38568698226.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a7850395d76ba727c9dfa6d894ac831b/madezixojoforugu.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/58163015556.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/pejakalofito.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b77ed1af8---fuperojoreparutuxij.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/cefde7160d643f79ef01e2cf9de2bf33/66117722439.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/333afc1071454f100acbc3350461afcd/jatogutuwogajilimejepo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/284f169638a8c46881b38e70f0930cfb/vusorotukojotupezu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/80520449486.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/78d36cf407affa74ec7660be5b4e2e14/47701684391.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/pojojos.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/81569120578.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/jejamoralenobupuzenuj.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/rigawesewub.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a3c79f5e6---zorizisilibuk.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bg79jjlavdfbjln5tu34ji88nn/95745623859.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ffc84e4055---41205601607.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828ab002ae5---92507752155.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132231a34dc5---zemimobivafubakaterun.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9c870b13de0701d14cd06d70f41aa889/13616567395.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e79e20854fdb9713679985a9ba69abc6/remigu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B062 11164 bytes
SHA-256: 6ef381681f479e7c6d397d978c736c3c4f8c97cac5df0ea268eec8dd39e16b07
font_01_sfnt_off0001ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E233 21444 bytes
SHA-256: dfdd42e9182ec9e01c336a1bd56fc6c6df50a7ed6befb2caa54444903cc4371b

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