Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a13d79b9752849…

MALICIOUS

PDF

82.7 KB Created: 2021-08-30 19:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 01503405722eb7faa407a24f9a2693ee SHA-1: b080171c9c6d6f9e9f1fa7dd9728c58b5775abec SHA-256: c0a13d79b9752849d65302733f4d282f2fd5d365870b7c1589f48c1b70804ca3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://porterbrothersltd.com/app/webroot/uploads/51703087890.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7155a7449180db00a088bd2052186de/53699142591.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/qanp05feamsug1ufio3c8dn0e7/90957587328.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4e7dd497---55450208002.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/344a47124572a29c2085ca906251de54/xekijigimoxefinugok.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/099b6b3afd1235e72da61c448a7800c4/reteloliv.pdfIn PDF document text
    • http://chinalabware.net/d/files/gizibixileruk.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/xipasasixopelafotafoponi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046377daba---tuvojadopavoxutapedi.pdfIn PDF document text
    • https://lemanssrl.it/file/43112022664.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/79614447116.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/85364757640.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f283a6e8bd6ee74e02734805e0947a68/19236247110.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16285010993209.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/s6msf8p5l0oq259p7ppkb8orlv/bulimerev.pdfIn PDF document text
    • https://deepex.hu/hirek/files/88556588212.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/31694877248.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/9288740952.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502081906138.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ac108e0d---wubuwafunul.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/51130689745.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8267c842---5356178066.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q8hmggp1nj3gp4t2vkjeftd29c/15315273498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wiping+sweat+from+browPDF 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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 10872 bytes
SHA-256: 84385e6bc1c3fefc008f9a037361df6e66e77246ad0d812c352fec2a98c9f401
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 18556 bytes
SHA-256: 07e14ce30ab8ce8b9e1ec517043a5ef930fce0036e7496a1321467bb481d628f

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