Malicious PDF — malware analysis report

Static analysis result for SHA-256 248cd24466687951…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 22:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4988bd20540dae72fc70fee3833f7511 SHA-1: 7d7c4498b13d396e7942cf0a0497f0e87a6b35da SHA-256: 248cd2446668795146fbe5c055ea855692b8e24917bff504a9ad1e7fd10b13bc
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nexxosrealty.com/userfiles/files/31040509915.pdf In PDF document text
    • https://rpaxis.net/userfiles/file/federowe.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/50667633164.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ca6f2f2b25084731a42c452c1200d613/digesejiletibi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b12a068408dcf94e8660f67952607f67/banuzedubemexutuma.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/2e5e6d54e20985f0302cee55a20cefed/mifujuvitiwaguz.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/ravoxuk.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a29815793e5e851495228763fbca3215/pekubagusasidezubevive.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c285b74288a---xoxafer.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/tou3nrbj0ttbc0jjdorau6cgs4/kuwomezitazomeze.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b520353089f---38938368468.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/59613895447.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/xeboxero.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/lesiboka.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/17077252488.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vamoxatumutejog.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210522064756_620636415.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/85681863199.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af97fa6f441---97085031396.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/90970161041.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/rotuzukamarog.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/54817548141.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/jugewajaxugufakonodosiwig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+education+trialPDF 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 10392 bytes
SHA-256: 39adafac590d83d5ab8dca8d0f96d294a087ed9548b9adb51cc88b49bfb0d158
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 17900 bytes
SHA-256: bfa1a3f256c8265b4b1829ee5f57340794c77cd9685e01c5dd1df6df9476b26d
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1