Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1a13c270f8800c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 02:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3ed6bee5855bf2dd0cf6c205212a770 SHA-1: 95b4065e4363076fa9d65d9f3d2eb066047f118d SHA-256: 9c1a13c270f8800cfc74dce764c802199e620ab50ec06942a21b763b673ec3d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9cf64714702921a49300feebd01c47a5/71692141629.pdf In PDF document text
    • http://arqing.es/ckfinder/userfiles/files/mifepuwipinuzulojok.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/femumipugirun.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/17503259044.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/35c0b70b9074451018c1afdc692404f4/gofimutifavejed.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/839ba4fdc866c1b8be764257f249e428/26078218556.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322cb29f92---9991584601.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/3ad5d65d3320b6f9f21f1e9cd6b47e48/sopigogiwigiweliz.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/valosufaxoxevopuped.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/16549530990.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/30722598832.pdfIn PDF document text
    • http://usagimatur.com/files/others/50274738978.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xopovigobojigasodulu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c792890f6ba---36691669095.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/58382001528.pdfIn PDF document text
    • http://flexa.cz/docs/file/63461475105.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bb400c639805b91bb16d9646e3e9d5a/95805866724.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2a720f33---17514057353.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/208974ddda8ec7f7069ae58d5309d1c4/dudajaboxipamanexepu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c177e72257f---68740902819.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e3ecdb56b---38288756614.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5ade9382b---50093776769.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/lunafefivinudamozo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9112e0cc788036d726169fefb7bf01f8/16338924964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=linguistic+terms+and+concepts+geoffrey+finch+pdfPDF 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_off0000b6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A4 11192 bytes
SHA-256: cedb829191d06ba979490e4318e0c16adbb533e8d865722089371852a1b32de6
font_01_sfnt_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 15108 bytes
SHA-256: aa8712d5d1bbfaaa36054012ac76a09211ad18db5243ffa6997ed9da1682f095
font_02_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1