Malicious PDF — malware analysis report

Static analysis result for SHA-256 a495cee27396b4a6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 01:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f65f1b5e3f0e65cbefd14d2b2304a959 SHA-1: 47de3df2777a1140161f9f75a3f9b6803c76f67b SHA-256: a495cee27396b4a61d6d81d131118fec9dbbc4e8e61531348a04f6e0ca8a7e86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=jurnal+identifikasi+kation+dan+anion+pdf PDF link annotation
    • http://peak-experience-japan.com/xovafozojivas.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9b92a9ec8---72701707294.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/tawub.pdfIn PDF document text
    • http://holzweiss.at/95298730385.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/69691885534.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b929d775c8---nawexak.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/99164945595.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/divubigo.pdfIn PDF document text
    • http://guitarenko.fr/img/files/guzerivitodijal.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1fcvrvrjt3dsp1hhmhu3tb1njk/55174046847.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d198f48274---75536735215.pdfIn PDF document text
    • https://medpressa.ru/files/file/35718435769.pdfIn PDF document text
    • http://talesma.com/E/file/2683897428.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/56454739627.pdfIn PDF document text
    • http://prosquash.by/data/53068957720.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/34672464194.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af8258e68---gotaganelogavulol.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5ea23udlnjlujj6l45hpk68k15/menogupijenedo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210612_6D2435F830E98E9F.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/datesawazekelesijibuje.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/defeduzopenewid.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/eadfq0s5i80p7a2gjirhgmgnc3/47220268590.pdfIn PDF document text
    • http://juentai.com/userfiles/files/timimiwelopomesoxena.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9043d681c3dbe29cbe760461f7cb672/valiz.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/tetek.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/11875886805.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_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 10672 bytes
SHA-256: a5497a51de8cc20f2e5fc3310a4b04762e13b072f6878f72c4264bc9320f3678
font_01_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 18336 bytes
SHA-256: 7565d886e2f25599e8b86a6870690f5df1e8fbdcc6182b496331b98f74ed2818
font_02_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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