Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8165b362a0cea32…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 12:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be91240e73801b7d717c233a654c052a SHA-1: 5377ed7dc0265e33c922a609a717262001df4d93 SHA-256: f8165b362a0cea32af08a2512e0a3ec2eacb9199cd91a1e4bbff45acd1ca860b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple external URLs, including one hosted on a compromised WordPress site. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination or to engage in SEO manipulation for malicious purposes. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://garglob.ru/uplcv?utm_term=john+wick+original+motion+picture+soundtrack+download PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c9570e16dd71fc8c748ca948004944d6/95632756479.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/556754340.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/h2sbu8enq7t1h5g1ok706m0r25/76409421135.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160919a4e64db6---62064230613.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b4f8e18b---sokinukax.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d086eb7abdc---69523525459.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/pidipuwawepitilometeloma.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f798910a406---ritiperovot.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/40c4322ad98415f1937ed7cfda3480dc/tujifaxuzarizasivel.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5b3bce800a02fb4578848d4bcc7d6a99/3691571875.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c76e396fcc---ziraduginavine.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/fulidepekatifa.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/73955665837.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7df082736eb525edc38807e05863a6a3/fatalis.pdfIn PDF document text
    • https://susta.vn/userfiles/file/35354095982.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ca409239---wusubuzuwotavopuwimu.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/tubidirugewasugizof.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a293d9979---fugufebites.pdfIn PDF document text
    • http://berbun.com/user_img/file/punamujikuvanul.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ee5523e9b4f71aef13ff7ad8f732cd1e/26187730971.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02d8ce7c38559d49eadd11864d8c24e5/xomavuwibenakutupape.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/naxupabezojorilupogud.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/19305229711.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e37db388---forojelebudovilam.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/zujonopel.pdfIn PDF document text
    • 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_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 17532 bytes
SHA-256: d0fa2022e79f3f596d235322f6faacabcaf75a7acb89bd97e55ee48efbe775bb
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 11228 bytes
SHA-256: a3b37b417d35b2f4617d4e86be16321b17127a26efbf2ae0e7533e00d3c005a0
font_02_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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