Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b993c354addde05…

MALICIOUS

PDF

92.9 KB Created: 2021-07-13 21:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b3e9b6bea72a620652c62228166edca5 SHA-1: fb185bc5dcc42eda2f371bdefb5d8ddfa6f8b6a6 SHA-256: 6b993c354addde054b9863c9d920a23b295fbf3ff708611b1a3a2b61ae204d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites and disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sweetburden.com/upload/users/files/41414645785.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160e66c1255461---potogeporoziwenidanit.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad039ab871a---66522468668.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/abc1d424ef2a24852a2c045cdd92b963/85353945076.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/93305051823.pdfIn PDF document text
    • http://cissi.it/userfiles/files/58485599902.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/babojisa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075a51690523---rovapisitu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d03dd5e6e---800862466.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad986184355---1908084130.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/5298367682.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/f4f13b3cc7c4bef3840ff11edf85c126/8664881553.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089be979ce97---fadexubiro.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae764a357---63593346718.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/3870750015.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e6410abc642---57960993046.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/44e0be01783f87a5c0e0cc55ab734211/wopikisovosujuwodiwexugoz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/cuk4crri2crdni4pkc6201u34a/jajaxokomum.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/beralilikikotib.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/burafogizijif.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/bb520a509a69a707f7eff8b0bb9a07a3/wisosununanodixowule.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b640dddc726---zutiluzati.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b7d1dd69da2d7dec0a184db4c4e281e4/3928037917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=songs+from+k+lovePDF 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_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 18124 bytes
SHA-256: 4f3e21a4549f331a782bf5c2f278e67f83736fbbacf7223dcbb76b91e2b6afd0
font_01_sfnt_off0001354e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D65 10440 bytes
SHA-256: cd348ae9642de5803ec97a7c7517555d9c09744568a50d466381baaed8a8d1e6

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