Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d31cefa3d5901e…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 20:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e99d00146c69099ae9339ae205b908d6 SHA-1: ba5874f02b7b0e9d5cbbd074ceefab240d787b67 SHA-256: e3d31cefa3d5901e3c407445c39902cac5d4ed8b088cb8f23925bfe2c8add554
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, presenting numerous URLs that lead to other PDF files, some hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content through a series of redirects and compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eghamatyab.com/basefile/bainbookcom/files/40564328996.pdf
    • http://7tec.ru/userfiles/files/duzedudifuzukuvikebog.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0glc4184qujed7inujvoupmqfr/vuken.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ac235ad5a66---negutipopuv.pdf
    • http://abovomedia.hu/_user/file/54550758105.pdf
    • http://aplus.to/userfiles/file/25334857965.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/fatojoxow.pdf
    • http://softwarefactory.nl/images/file/nomuzamotonubiwub.pdf
    • https://study4student.com/cache/fck_files/file/62341998406.pdf
    • https://abeess.com/userfiles/file/lobovoguturijen.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aed06171---fopaxonamikexawiguxo.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/buzefagomedixetavij.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0d2bbf53---zazuwapuwefi.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cb0d734465085a13138879397bcee776/85368230389.pdf
    • https://securitydm.rs/slicice/file/zarexexutizegexomo.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/dba77dkihcs5a3jc6oq9qq5qna/33858730509.pdf
    • https://atamergranit.com/userfiles/file/lirawalebukubatuboniseka.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7d6bebe---917861212.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac2795058---titovog.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/7l1jj5elqbqcriv0olpb4t13pg/jotojarapularolitugu.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7ec430f19---22272101550.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e78d49a3---zejega.pdf
    • http://industrialdevices.in/uploads/81339068202.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea15970a2---kuwoxofi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d76664a18---fobata.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087113bceb87---wisanirudewezabusepos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=banjo+paterson+the+man+from+snowy+river
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb33.bin
f70b04ed8e9e0111e5ef961b0fe3c104e17a79a44f0f5b7eb578db95c945808b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 17280 bytes
font_01_sfnt_off00012855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 16792 bytes
font_02_sfnt_off0001406c.bin
2e27b9543da4f63528e22101923ac4f13dff38a79a1129924d37f3e43be83d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1406C 11024 bytes