Malicious PDF — malware analysis report

Static analysis result for SHA-256 89447e5f1bfda350…

MALICIOUS

PDF

93.9 KB Created: 2021-09-05 03:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ca65d0249727740ec03d0bd2cd39a03 SHA-1: b086e659ff7cab74569928564c7089acc2c5dfef SHA-256: 89447e5f1bfda350f2bcdc5b59b1af017484a2d33147fdfeb5168f55a47adcb3
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains no readable text, indicating its primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1cd126cf3---2113710533.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/381fa263aeb46bb343bd34a184fe23de/46471702099.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/71197030482.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/18398177789.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/tugijejisapogugaluta.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pl7aj0r8tshg1ngpqrckj86cb3/28445537118.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/xuxuditafukazuvagev.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17e24e875---99598991260.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/97649347383.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/99402261262.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/76188614126.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a14407661---bapogozesoxolavifoman.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/poposev.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/49005030638.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/1ir0cmp6v4cvdn9dukmr47b2r8/tetavuxisuzusajapoge.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c09ea5337602a50199f84aa74d182faa/tosumabux.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d5837dd98d2b9bbfa46040af6866a6c3/22112170238.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ehl675btojj092bv2tp4vnago8/59734195448.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b941eb32fc999d9b3ce5e15d2cd5df73/malodinomotelukep.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/57415591023.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/65027065672.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/mufelalur.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/4645382192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=frost+the+road+not+taken+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_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 18844 bytes
SHA-256: 7dd592da64782c3ea112084f652f86e06e9db7a06f30775e00857c2b71f68997
font_02_sfnt_off00015222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 10524 bytes
SHA-256: adc37dc7e65c60aa8509472828c33e83b2d2e441363ea99c549baef7344a91de

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