Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d8da8fe268db69…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 13:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfa5f2e77692a696f91082ef84ece6ae SHA-1: 2adc29bb1e2e20f17fcf437949207ea7ec2f6e24 SHA-256: b4d8da8fe268db6953d60b72ce7d1269cda659d45573e12a2e519c34d106975b
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to various potentially compromised websites and IP addresses, including a WordPress upload storage. The embedded URLs suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://61kidsclub.com/userfiles/file/nutire.pdf In PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jujosezelotimexegere.pdfPDF link annotation
    • http://eatoceanic.iorderfoods.com/uploads/files/5323724081.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/48653011664.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9d8062262dd48d02473a61208e702b3d/laxavokug.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/lazid.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tekopimavoxabumofel.pdfIn PDF document text
    • http://yuha.be/_files/file/zerafikamasevuwivaruzil.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/zugomiwunupazig.pdfIn PDF document text
    • http://bastola.org/userfiles/file/41254113115.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/dawejigipororore.pdfIn PDF document text
    • https://777mto.info/contents/files/12871923091.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/tefop.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/baravewoxe.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s8vg0prj4d0s5oh4uc9042ntn1/85108160289.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/27767933264.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/gilusiw.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/wosasifuxixotawovilakilib.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/zurekazigekixedifo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c98dadf857a3cf255aa2f5aae90c759a/jimuwezore.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/45612004.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/rolevojixekulow.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/87764062582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=demon+slayer+movie+123PDF 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_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 10696 bytes
SHA-256: 0bc005789bae141ac710fcd240dbcbe05a8b96a11ea2eea1bd9ebcefc022b913
font_01_sfnt_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 15432 bytes
SHA-256: 7b832e353a54dbeea478b4ba00ff135728d7a17a3054e99809d71852a93c6b5c

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