Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a921206f8b8a97…

MALICIOUS

PDF

73.0 KB Created: 2021-06-27 14:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 561e1e0e175c374a071dff9fd1f1fd0d SHA-1: 88b824e221eba922c1884dc5b5439896afd1edcd SHA-256: c1a921206f8b8a97e9593c854b55796aafe33bc8f9bfb95754880ac9b63a0992
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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or suspicious domains, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to exploit SEO or compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a6e33c3a---jaregum.pdf In PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/gunugalixizer.pdfIn PDF document text
    • https://medtek.vn/storage/file/dixuvawowasarazenu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/f37n7ak4nqsclbrsuov2p26ns9/bamalabim.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85aaba400---56435259684.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69090489428.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429195432763764.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/58211541078.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/825db72924757f5802ebae7777c31808/15990019208.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/vowazajojanapalafemodixe.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0f647e5d---bazufesof.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/rawusufopozorijoresu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24d31893b---puvabidoruloje.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/79337479261.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/83bbc527345ee333d174297b0a761766/63868214175.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2bd3dcd4---75520726692.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/lejogaxatapokipowi.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/regenir.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8b04ee90---pedefulinazemuvivudoluv.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c9798b16313b16438885026f750e0260/36612659072.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/bopugawufiwis.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5552d37b3a---46080839081.pdfIn PDF document text
    • https://businesslife.com/content/file/90337761574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+the+equation+for+the+axis+of+symmetryPDF 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_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 10972 bytes
SHA-256: 6ee446f5bf329dd4308230de82c0843a9e4a35aa890ccc590f0f2aa568355f0d
font_01_sfnt_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 16048 bytes
SHA-256: 6300fede8f329cc17241df59fdedbb01b7e85fef76918b8ea318502de164744b
font_02_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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