Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9072ba5b23c692…

MALICIOUS

PDF

101.1 KB Created: 2021-06-25 19:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0e7db30abe51d926164fc94c04c3ccf4 SHA-1: 88366bd69671fd0708082f333e95b59682b45a63 SHA-256: 1b9072ba5b23c6924b1a08a4c49bfda5ce7d09f83508658ce7bdbe1b470fe267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, likely to distribute further malicious payloads or lead users to phishing sites. The PDF itself does not contain readable content, but its structure and embedded links strongly suggest a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b55304e7caf---46382980448.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7431edf4.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d5234e18c7d4867a82829cbeec86e33b/gunubofabibikonaxe.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ca01983c1f31bff5c1f86eaeac3aedc/49564278836.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/h1l35sl43iibhfq3cq0bs35piu/vapejus.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9c5e36fbfbdd5f66db11e43beba18adb/81006858633.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210509161623.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641222c8d9---tojemekijuvuwajer.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076067e1ff1b---56793437811.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9579jar0gu56ahfqqjsqjnrdh6/76878864575.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/86412709532.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ospba5ot7dnught5e1v54qrt7r/vazoraz.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5607264bbd5e4af66326ec6c24fc45b4/lavudiwoluboberadef.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4pr3ghs8oqi1uk2bq049o8kq14/94292276220.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941157b6de2---loxowexetisiriwegozejig.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/55553500138.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e185dfa58---3746071419.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8d052rs5475it7uev9erv9pfl7/wopixemuxofitetezok.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/nuxifazanamekamesovafupe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608423258168b---tevuk.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/pufodeduvufudobawo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/51090ab9a25bd30aa9fbbb7c848f1283/98343285616.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1dec4f7c437b197ddd593c552bc89cbc/25485108762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=howard+georgi+lie+algebras+in+particle+physicsPDF 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_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 17960 bytes
SHA-256: e39c6b46a994cd944dd66457ee2c69f2f4474a2c4c0fae4503536c9f6b961006
font_01_sfnt_off00013f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0F 11124 bytes
SHA-256: b6f90f12d247a55ada310de35d6203accf0e6670f219aec39e1b5c3c9c5fd405
font_02_sfnt_off0001588e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001709f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1709F 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29

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