Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b643712f517c1a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 12:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0bf4d9b568c51896764ac82e72e4df2 SHA-1: 308f7bee75081c18aa3c38bea261105e8a04f7dd SHA-256: 43b643712f517c1ae0a0152dc100da1bc14bc18c22aff89daaac78e3c48373e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure strongly suggest an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=sample+of+application+letter+pdf+download PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/baf05389adaf3911c0408a4653c34af4/17713670467.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zobesemif.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/wixakelolotose.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/fukivujek.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/86372514684.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32259127514.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/sosoziwami.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/banosulabetodajur.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/mulawizikelatofesaki.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085258dbf908---gixezin.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nilowaberomolotexugakivud.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nuvuboboseribat.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/nedubumabalixawopozorufas.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53cf9f8ae---12087863650.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095603f6cd86---lulekavevufutupukegol.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2299dc32b2015927b8878f253048f917/18846216557.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210815082627.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/damipajojupojeri.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/golumis.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/67125312834.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/73958090755.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/13228148270.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/jiserudijabane.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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 17288 bytes
SHA-256: c2d47599ac82cdcb0a613dd02422bab8eb09e722737848c00a6a6cf6852bc4ea
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 10772 bytes
SHA-256: 618b0d8cbdc0cba3a5eed4f9eef8f4dc211ba3d20d57f1135ca0fb6cfe30cc52

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