Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b76346392ebf6a7…

MALICIOUS

PDF

102.2 KB Created: 2021-07-04 05:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3067a81db2c61345c979ba640b0d5608 SHA-1: 54a41e595c68091144e87f88f7a43ff680569948 SHA-256: 1b76346392ebf6a715418633361132083e3686a9a507ae086df243c97a43e74f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45b4261d2---54182759028.pdf In PDF document text
    • http://apsons.eu/files/file/gejilijetarowejoxegozete.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dumodewotuxalikemubogozul.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/98951660802.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/38979780682.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gotufadevapu.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a5cba9b4e3651b4f7ab7298d636b5ca4/73324849859.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5052ekfcguolb4co4u5aa95ov4/dozivuvapurirulomukixe.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/91950077954.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gg8ji7al8uh9chkg9vig0r9j2g/gotenalu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/fagituwolopikajorofum.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/99973574347.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160897766c8e33---soxenonabajutezoxok.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/pidal.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/7730857034.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/28696831227.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/gituvizarajudapanuzuzexiz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/48j1an9qlm17obbigid673ndh7/90531649612.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/mifob.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/43757953758.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/tuziwulitowemedu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/gkiun43teck6fkbigbrqjm3ba5/vexupelizinuxazeredazez.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad71026ccfd---kubuzolimekajo.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/muxonasizuxeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=labour+meaning+in+bengaliPDF 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_off000134b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 15556 bytes
SHA-256: 72793fc258404ae7de94b887be02dd150a44fd2b661db598be580f5016f397cd
font_01_sfnt_off00015bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001740e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740E 10384 bytes
SHA-256: a700d53d12f1cb7beeec9946ef8659a91a5c18d5efb35f627c17ea0bc96e72be