Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dcb59362c5ce9e…

MALICIOUS

PDF

134.7 KB Created: 2021-09-04 06:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18da61b610b595ff0bbd7c24a3a456cf SHA-1: c0615971475dcd90bb6b54c51b341a76ed7f7db9 SHA-256: 13dcb59362c5ce9e7d33f9ec8c4649b2531a121314535f966d1b9b81ce61073a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the nature of the links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://italvaping.com/file/mujozese.pdf In PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/96417894489.pdfIn PDF document text
    • http://geodez.com/pliki/file/5231686440.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/32716072980.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/82753708086.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/nozutupufixirogu.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/46969547358.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8014d14bf8---37231613764.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabcce768c---76848819626.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/40887290054.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fo9j71l31a01k7sgj5sjbhjict/51791259235.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/legopetedonadigenotag.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074969a21045---votaligakixilojidalovaw.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/kukamazorovovosomujedewab.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fejulasuwepabogewifejiwuk.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/j5diqu2tpgb57432462jdu7cjs/dalitomosewo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/14742759815.pdfIn PDF document text
    • http://juentai.com/userfiles/files/timimiwelopomesoxena.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/lufamipuge.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/kogitawevajarani.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a6c3df11a563eba633e18ad34438b37a/juzudowijobokifupe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4791d28d6---74089598164.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/55144941397.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84156657267.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/76198206425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=environment+water+pollution+project+pdfPDF 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_off0001a5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE08 10980 bytes
SHA-256: cf8f6f5c6c1c4b405cbb7b8370919fae8d202f496c583424eed2d5b155fef327
font_02_sfnt_off0001d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D77A 20144 bytes
SHA-256: 9e41c2f7207df57b3989abd260e510e63ff3b84719acdc9fd63e801a3b935932