Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ec2bd0315df883…

MALICIOUS

PDF

93.5 KB Created: 2021-06-25 20:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8556d4d3db58bd84b985a4786525968f SHA-1: b171a1dcefd1e01c26a9f49d496e5bae5156a6b9 SHA-256: f3ec2bd0315df8830c9ead55bc2d86a3ef38bc7cac38137529c005dae8fa2dbc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://huntic.ru/uplcv?utm_term=describe+the+teaching+of+jesus+christ PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1c1377ed5a8802a8787d8c7eb020105e/solasulimemojevereg.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/rek83ng9bunitkcq0sp5shg2nk/bafagobirazemi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4dbf09c35116d36df11995e20d8bf0a4/nipoxuviropekudisemaki.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090d7a952e3e---kanigamogikowejomemuvo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/20266967209.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/pawutotinilavel.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/uevqo3ki39jd446cm8uojqj98e/midukegomibik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b14082c2---29085967334.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sowadanuna.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/96183532892.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5f1dff19---sinigulezato.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6bkemdv6rnri46df9q7efelboh/17260054391.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/5333030218.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1beb230bb2---zolofovafimexot.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/aitli92t3nbvilavdpe1m3eelm/97624389669.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/72012d2b59d3cc6dc5aa30ce4ccb858e/rosiro.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa96c30d1---lanusi.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/81719938382.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/31573348495.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p21gftpnu6i5eb32jrcl5j1fnp/28868750037.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/bikuvopagito.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/13607366619.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c8cb180d---98203867678.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/pafamefasibovavalajijeke.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000148e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148E2 19048 bytes
SHA-256: 3f107e66d680d8bab6eca20eb069e485a53a9af3b048d022a357e8297476577e
font_00_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 10940 bytes
SHA-256: 5e6b09f1aec1c605cb3d32862ed9c196f836e18fb8051dcb57e20ab2740dab14
font_01_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 16792 bytes
SHA-256: 1c215319e757a186aeb69675ac92d56ab3a6579bb0cb3e759aabc8e050ee95a4
font_02_sfnt_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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