Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3ec711a3b0dc7b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 03:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 686be8e25c663c275d76aace2dcb3c6d SHA-1: 13ef84d0d8f7d5eb63b211c51451199e467fa395 SHA-256: ef3ec711a3b0dc7bc1ae3a36cdcfe84ab242cffb69c01f79f48575d38d2ad073
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and numerous external links align with techniques used to obscure the ultimate destination of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a0c37931---vixifoberegitiwevodirif.pdf In PDF document text
    • https://cfbadalona.net/ckdata/files/vimosim.pdfIn PDF document text
    • http://108homed.com/userfiles/files/rebaxasebavobakugutomixi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f5d057c5---26899265190.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/86501465181.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5632788aa4eddb1b3891af2177eb7d18/vefuzomorugudizawu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789621740ca---fefamenofifomaf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ho1lnpsqr1u0n6rnh1kqsf237n/gibivakemokedef.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/lodowojubijemunaginiso.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/mezosapowe.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/99966406330.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/vibowagomaloxuvasesowo.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/78858502587.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/k4mamees40v5ge8btomp8rpcnb/22472008125.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/777fbc35f0f34a95ec2b19d123fcf452/kuxemizotoruro.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/1105127703.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/vakufoxazokubidebi.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/xofarajugunudevip.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/nanizumi.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/zedisetoravikiruv.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe942714ef---32160496099.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a324d0518312aad50452ac06c93f17e/31234994195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=godrej+forklift+gx300d+manual+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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 11432 bytes
SHA-256: 6570fd1728fb2dd4b52cb40501d93ba6e591ace59d11ae828a959f36923bd955
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 20028 bytes
SHA-256: 62c1ead67d5bbf5e6fd1602a0283f27286b138923734748f3b1fb0e79912b0c0

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