Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd78e13bc657e72…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 13:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54c518a0327cd60ea936ca63ed81d7f4 SHA-1: 5d77ec9a4684a51685e535ad98281fb6e4a9d465 SHA-256: 6cd78e13bc657e7231f561fb1d5fcd2ace4594db5c369b8f2ad042b6770399dd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links to potentially compromised upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mebco.ru/images/file/bitesobizipotagurazodeg.pdf In PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/282f74e33c55444d013a4c3382ef3769/nugodoj.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/33659924bf754cd3fc6fd6124d9e3a48/timofud.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/40292944276.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/39904842459.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429110954915986.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/5gpku32e62cd23ujvu9pect13i/fizugunewaxomezogun.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce365b2f4---fadakeroweluviwibuk.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abd9ac165---6082335348.pdfIn PDF document text
    • https://primer-spb.ru/files/files/vuzeni.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/fupozuroneralilanivo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/856a462ba7b134faf521a0eae3c9deb9/25547260065.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/fbd290d7ace36569cf7a2c37ce0f24e9/78797210533.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c4aaa2556---mawesa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6122f6aa659b355d29018ac080c0b59/xalarisegabagov.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/88922276061.pdfIn PDF document text
    • http://suaups.net/userfiles/file/10742244883.pdfIn PDF document text
    • https://akconta.com/uploads/files/96437106578.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/73673364266.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9d2067eb5005716a2c725dda044a9304/nipuxajugojivepugagiko.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/11684757641.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/50237128340.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b5de6f975---zilosopotofoperakatosi.pdfIn PDF document text
    • https://blogsma.com/files/mibofatubuvereref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=green+revolution+project+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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 16776 bytes
SHA-256: 7819b424b8564197bca6b8867a677862b55792507751f88cfb3c275dca996abe
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 10616 bytes
SHA-256: c44c33049b8a45b8c0577abe9187a80c5b2031584560d11e431c9259c25c4dc0
font_02_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1