Malicious PDF — malware analysis report

Static analysis result for SHA-256 10470b262e9d2a19…

MALICIOUS

PDF

79.7 KB Created: 2021-07-21 22:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57a28ce9e4faa7e6093197deace6919e SHA-1: f5a46b4abcc9f03db784b415246c617173538e65 SHA-256: 10470b262e9d2a19478748df67152b8a3963a6c38723fba74fb40218275a93d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple URLs hosted on compromised CMS upload directories, likely to distribute further malware or conduct phishing attacks. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09e568723---rasaludawagemafoxa.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/kijukakaxeda.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/57ee9b7e4682cd6fc0eff4627e56cfc0/mumagojovek.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/zinenu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/588sabugbshjnv9nj8mdbh7610/tavawidagotopofeziz.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ffca5eb7---13641746041.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/sunubajukawajop.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/54308299293.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/754c536f45982d6c0f29fe2780c4be53/43240074185.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/fijopoleloj.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nuzurumagasakewazuzapeni.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/59264736481.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f0b8f207f---71721997332.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/newuzasikomipabukevo.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/kejebesomisix.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/57987347878.pdfIn PDF document text
    • https://airshow-bg.com/file/82966518236.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa3a69e898---firoradupudawebifom.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/48298dadbad21dd7620f4fb9f1be96a1/94898433656.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/juxawapotiletifuw.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb30e6e18d---15405832996.pdfIn PDF document text
    • http://st03.it/userfiles/files/54392397970.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ab4d6392---94772904131.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081084512e9f---mugomu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56aa8aa28---12477425653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=accounting+principles+7th+edition+answersPDF 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16052 bytes
SHA-256: a38a4f0689a5098d0ba10b3b488053603f82e60023496c444e9b5c6afc0c10b2
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 11012 bytes
SHA-256: aa552eee7e5acec561c2f34cbfe1065cd31c5ea29057a3ef616b7ebe317bda6a
font_02_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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