Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc14a512e69f85e3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 06:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e457606c117fe22153c74755e1469eca SHA-1: 13adf14927ede10f722845c22a44ebff5482b4a3 SHA-256: dc14a512e69f85e3a5d1c1aa48945c565ea1a8140073da64e6b70a79bfa82208
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The primary purpose appears to be directing users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/crbvdiuvffj5kadvujkrn92rt6/juxofariburemifibil.pdf In PDF document text
    • http://arniestribu.com/campannas/file/20041020279.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/47929298374.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d993d3703---99656886440.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/mujaravexeronapidejenavo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/95iig7bjg75hdk3ts1muf5i690/dovizulesuke.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b643619fac---buziz.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612acb43dc048---zuwasozo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-19/20210819154352891875.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/domaripesaragajuruf.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xojomadurobazugebunafo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1151dfa680eb381110539069241c9d09/20178804790.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a46175b5cdf---wimedalufenesesebibo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f4q3o5o6eli3gtconj923q5qr7/79829279094.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/pareberulobijoku.pdfIn PDF document text
    • https://hoalavender.net/upload/files/bovemonot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e842a2191b---70529017743.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/92071671136.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/59157581775.pdfIn PDF document text
    • http://vanhacollection.com/images/files/25320831870.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/4jcno0lgj3nd6ug7so4gdlesvd/36496698967.pdfIn PDF document text
    • http://yoron.net/up/files/73528225163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=management+information+system+free+ebook+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_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 11132 bytes
SHA-256: 13b861c83955c53d76e8fac8c5242fc89e1987824258502c73f26bd722f29f8b
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 17492 bytes
SHA-256: e0082e33561642cb86a659f65bca9eb08b259d64a3667323031b8681c9e1a894
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1