Malicious PDF — malware analysis report

Static analysis result for SHA-256 0285776c95a32c56…

MALICIOUS

PDF

85.7 KB Created: 2021-07-10 01:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 30f946e04dc9228ac3b0300c800ba0c2 SHA-1: b13fb188cc4c9f1013bf198f471b3ef969df5852 SHA-256: 0285776c95a32c5618216d64a167d3938cfe6d310f6bbc0f57bdbde2042a5dbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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=side+effects+of+arthritis PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a911d52701b---jijuzelejonibepe.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/jipusulufob.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/56445eb433ed1982d1878bcb2a7fa6e2/rujenufixobewirimarivi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a3e68186---2778703429.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/bojuruje.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/har12hnp0a70gj86m35k5ah716/mamaxixomojufaxavi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jipikexikov.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/28312308092.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0b1b438ebc7ba731291c66881f2812a9/93165229759.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/48a29ff0dd1cc93a681a926d13868106/62479121269.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98226930219.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/vomololipi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709526a0b80---garinetifamuzetujo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/87833077570.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/xelorebom.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/gokamupugotokopevu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/51668225889.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160939f0a16198---42024102169.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/varasakufaloref.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/fedepegusu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/milukedosixiwe.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2086e0dfa---jiwaxarefodufelewoti.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8acea0b1488b91103a7c3416e29a0b86/92469628547.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/giwezezojexirovuvopamito.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a84f6cf24---gevaguxerarefafewosi.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/93440749345.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/130b900352a1b6953a629f7a23129417/felutixot.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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 10500 bytes
SHA-256: 94eff023e46b52407e0171cbf41235ddcdc5a55972af2acbf9bd72a8e51b4e2d
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16892 bytes
SHA-256: 27abd07019a9578568653135878f4ee1566b388fad0b648e6a1cf2e45d9333d5

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