Malicious PDF — malware analysis report

Static analysis result for SHA-256 668629b527714853…

MALICIOUS

PDF

158.5 KB Created: 2021-06-27 07:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db66a2647263f7fac70aae39d992035a SHA-1: 40a5bdade3feace982b090e04f3929bd24f69ac0 SHA-256: 668629b5277148530b5bfbce9194ff72b7b8e0c658a6f6b6091d7c1fb68292d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc8760b82---zalosedawoxeta.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8fe03c5eb---judilad.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a9293112b---watodekoxadonezikomate.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e61f282b80c057f3a8c8522e19814f6f/61190733670.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/19483451504.pdfIn PDF document text
    • http://ubest.ru/images/file/17909300553.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/jumevitopamu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf884a590---48375116654.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/q3gukvoikbhaiv53rutvgc2f66/loratasovebirosukakow.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/052eea85d4e1309fe7b6f9f8ff730ff2/womedifosufig.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e3464cb01---xetebebeme.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e5ad2037---gibepufosusoxuzufo.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4b3c246c---xijizozelixawoko.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2d76e99d6c20770286140921d8a471c7/dolapekozesunaja.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1fe24a53352c4b98acaaf131ee58a2e7/31077233405.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160799c3c92538---86908250162.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ad1529f34d7a6d98a1d7db86fecec1e5/weferimidokamoz.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093f83d94e7a---65679916287.pdfIn PDF document text
    • https://dhesient.com/media/naxabawebiwelagafosa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/97d18aa4026f22bf281e4e54f4616898/96593818572.pdfIn PDF document text
    • https://x-software.cz/data/file/13444145746.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb63d7ce99---29739002077.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/21611720428.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7075e1cc7811efc3a00dd94a5c54b81f/tufevax.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b85038cd345---vovevuware.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=donee+meaning+in+teluguPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAFD 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_02_sfnt_off0001f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0A2 16100 bytes
SHA-256: 78c506024fb9de42d56e5d58f79ec0da93ff6eb51bd904c152488657ab8142e6
font_03_sfnt_off00022190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22190 10284 bytes
SHA-256: abe679c8fbaede686f13dc91536d420a46cd2bfc1369d51e156c801e667c6227
font_04_sfnt_off000238a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x238A2 19164 bytes
SHA-256: 0d9f7c1de458113efeab902fa3380fd1e0a3caf953475a0c33386aada9d968b2

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