Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faf677a5bf823b5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 11:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d26bdf2c8843ca874979d4ef0c0d17d0 SHA-1: 52d4217c30e19794cfa9691787b24e1c8db02f9d SHA-256: 6faf677a5bf823b53dbe8b5a7f3242149e8d90c4ed7dd31e5928b0000377059e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a link farm with numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript and the link farm strongly indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.bluefashion.cz/ckfinder/userfiles/files/kefurazilevobev.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16139307d1cd66---vadaleweduwikaru.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/53099153694.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f72e5710ad---xusoxolotivomifubuzik.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/81685088636.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/41394075816.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/rivogokotakuwozetebo.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/30675252594.pdfIn PDF document text
    • https://ibericadearmerias.com/file/48282052835.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/bowakolezuxo.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/moxijibax.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161375c2385d31---wupixolujoxeju.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/funukaselulefutarimadadez.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/82037679589.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8f0e6b6c---nosepixavevorawozo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbbac011f---doxexarukemibogawutuw.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/mizup.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/76636713334.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/5044256136.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/zosasobivubufegegu.pdfIn PDF document text
    • http://portableandcool.com/files/files/vomivitubikilug.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/89073147539.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/63772053869.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/48458529289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=live+kochu+tv+malayalamPDF 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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 17792 bytes
SHA-256: 88364111fcc75dbb0ed71855abb5824f03fd0d60c8e43a2116033f7dc59498fa
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 10452 bytes
SHA-256: 64dcd5495692e15fc4855496ee375e25bf44a4624700571559fa3b52f4a3b169

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