Malicious PDF — malware analysis report

Static analysis result for SHA-256 184b71c2c6c2c7ea…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 19:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe8790f9b966b143d147ff6ac0765522 SHA-1: 70b6bf4a8339a97e430b4f0203bb68a72830788e SHA-256: 184b71c2c6c2c7ea59a7bb8d14862108d3e53c322f19c0ed65192991a96cb86d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, a common tactic for phishing or distributing further malware. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous external URIs and compromised CMS upload links strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nuitsdartistes.eu/images/file/62800072532.pdf In PDF document text
    • https://macroedunet.com/userfiles/file/27599225349.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/611h4ahsf5t6albuagm1lpn1mj/6630911886.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nbc5s7pn5q1bieeka3ik013ptk/44385681495.pdfIn PDF document text
    • https://alpinashop.bg/files/26020616964.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/47284866701.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/90887066402.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/kotafudelireralimik.pdfIn PDF document text
    • https://pokereshop.cz/data/file/36459253039.pdfIn PDF document text
    • https://webrobogo.hu/kepek/24810475768.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/85892855111.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136e27f68d47---kasekebanimil.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/4716149688.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bukibesejupegoritubeb.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613554f792716---zidiranawofavegesawiloma.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc448e4430---kenogesimigejonepufulat.pdfIn PDF document text
    • https://robodom.si/files_vsebine/60396561632.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fekufo.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/40098069223.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/43098455462.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/kaketefeseretixotorasex.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/feruju.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379f175947e---93323369793.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/577907368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=4+easy+guitar+chordsPDF 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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16972 bytes
SHA-256: c6f2d45eeb656177041b91cdc21c3702512479ab2f6cae7d02418030c17becfa
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 10696 bytes
SHA-256: 912c2614e26e970b8801ad62283513fb964e9871c1d00e369fc3675123b8cb85

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