Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52813278c8962b3…

MALICIOUS

PDF

102.3 KB Created: 2021-06-29 03:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4e1ebc329a8efdb5b9c5765f39e254a SHA-1: 51ce0547a191bbde34e7d5ef284202e2b920e1a1 SHA-256: f52813278c8962b35d1bffa2a247932bf198bc1ca13d6a6287acf482b6e717bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=report+card+comments+learning+skills+and+work+habits PDF link annotation
    • http://snsi.jp/image/news_file/92477855373.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ec779e8201f0053a103037aad65ae18/baber.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/wirilikodexod.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/36715652802.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/fipapeneferasikamixareju.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d695077c779---xejerakoromezivud.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/xobiselar.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a314d18c0da---winubi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b26d5d853---68764564161.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9639fae256---vuxofudisafoxer.pdfIn PDF document text
    • http://atya.eu/files/file/23953332176.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/xefolulixasivuk.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/54563318927.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/88370652753.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/82178397777.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/86106108652.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc889ac6b04---9509509254.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/192922841260da483b30c4d.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16079abe025fab---bisavatusuzejusidekut.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/c242bfdad070e4f43c8c06fa024dfe0a/83967988728.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lolajazimakovuwefabezazo.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/23658546438.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f85fc40a3ee691d6f935f36ff5945029/38170397705.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/98858472931.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19c056729---wavifugoladuwakimedu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 17048 bytes
SHA-256: 938c8c5fe9366a3570e0d7b02920949872edd67a51a8e14f4870c7cc3f80c926
font_01_sfnt_off0001577f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F96 11324 bytes
SHA-256: d93825c035f3a68376651d051f6d92a236ae4e4d386329125b9502dcd3fb0cc1

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