Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b9b33f00f9232d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-12 23:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 64d1a1b5af75165ec543a71f151d62b9 SHA-1: e5ab72d8b116a887572eeccbbc5fed5c442b21c5 SHA-256: c8b9b33f00f9232dd3967960a196345f15c440d928d4b5722bcaee2faf20ea06
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, as indicated by heuristics related to lottery, prize, and parcel delivery lures. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://sunnyvale.com/wysiwygfiles/file/79442334494.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7db61ca04d9f8389b1dc4980925c2109/74315569159.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/futunixilorujatexepugola.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/8968ed2c2a405379c91a3c2000fc0d24/nafedetet.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/klev72epk1rmbep9j5l4pbl76a/mewudobuvidiladuxizuf.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kozoxolibudebolebimiku.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430141306983286.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/kitepifimisuviz.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25006798122.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/16832315981.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/bukomupij.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c365a03e21237e59e1ba96c46c4c7431/tanuzikarezimisarup.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3698f33c5d6e62dd110ed304eeb95168/24088118561.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/pofogetofetuwaxom.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/782a1f2380323b78ffecb71bb3152e17/24625334127.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160856daf1239d---62754092922.pdfIn PDF document text
    • https://bio86.net/fichiers/71792620804.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96d3aeb71---golebakud.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11d347ceb---25203647215.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/27142670364.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd2db4951---64135736102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=happy+color+by+number+freePDF 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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 19440 bytes
SHA-256: ecf615d9436c31347293ca0cca74402ed5cbfc4f386011dec46bc2a815b55363
font_01_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 10628 bytes
SHA-256: 79846f1824c789fb322ff3d172ec52e67046340a88ba6c2644999ac139492c18
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1