Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a935b578e4d861…

MALICIOUS

PDF

83.4 KB Created: 2021-08-19 17:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c3042be8dfb7663926f8ae72a9fe5d9 SHA-1: 802f54d657d54f37253801ea06509d1b6ae39525 SHA-256: e9a935b578e4d861a22d4446d83a825fdb4a3bc4da764751c6ecc65ac18ca911
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=boy+band+kpop+idol+mod+apk+1.0.63
    • http://novastal.pl/userfiles/file/71056985690.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe29c5f36---pawodapale.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7f8e932a---85729253674.pdf
    • http://resortvillairene.it/userfiles/files/93304861495.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5faf69150d---mofafim.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/u1s3o6bo97krav39sbe0rdr04t/texubiwuta.pdf
    • https://virtrade.gr/userfiles_lybo/file/34072230307.pdf
    • http://champaigncursillo.com/userfiles/file/zijukufagaf.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a76322e88522a4dcd1682946b18b13c6/2192772020.pdf
    • http://angarakshaksecurity.com/userfiles/file/66633822498.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a9988ef9---midem.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607654d7304b5---16858462124.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nfq5rv1iiam54lvk6h9unif5it/47165068165.pdf
    • http://beijingxinzhi.com/userfiles/file/20210510031052_888203979.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3430b92f5---webitaw.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l6uovsl0hq2h6n0e2ko72lnomb/7522650470.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hrgrhh0mkq6ck7rpsv8okikqsb/wuxupofotokakiwukotuzena.pdf
    • http://fipjp.com/userfiles/file/togiwe.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/kuwivubogebap.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/wesidupepikeni.pdf
    • http://exmar.it/foto_fck/file/zazoru.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e6a22dc1---49464009536.pdf
    • http://lamekatus.com/uploads/ckeditor/files/nemojawul.pdf
    • https://cowichanseniors.ca/userfiles/file/mijobaxu.pdf
    • http://bienbao.org/uploads/files/sovusebona.pdf
    • 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_off0000e04b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16792 bytes
font_01_sfnt_off0000f862.bin
525511d7d3b1616beadd387cdb8769d73a1dd437295b7862bd3c5f1ace3e95e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 11032 bytes
font_02_sfnt_off000111d2.bin
fe7960a91db4357ac0f84dd15171cb65aeb30f16d55810481232ce440efbbf88
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 17840 bytes