Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c1c0bfbe450784…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 16:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e22232f9c4c9d9eecf03b914bd517848 SHA-1: 6a1185f6ef1c922ca3d0f88a33af2a85be011dbe SHA-256: 57c1c0bfbe4507844191f335cc051eb79ba7b18fdd26ed414476012e15c47bbe
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=square+pic+photo+editor+download PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/324483a09cd948a9a46c34618b9195ce/lupalezu.pdfIn PDF document text
    • http://quranday.org/userfiles/file/44667532025.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kfdis8ht82oe3jddijp030eng5/pizovezelemadorobuxosisub.pdfIn PDF document text
    • http://446888.top/userfiles/file/xinuzumibaf.pdfIn PDF document text
    • https://blogsma.com/files/50065241377.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/nedulifuwaz.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/419bdf8428bf113165e430e65582949c/wivudegewanenuxak.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/81639617348.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/40928491593.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/75530323879.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/jididipoliw.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zitabataridawonusa.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/bopokekegabemili.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jifawovoluwibida.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/93928142991.pdfIn PDF document text
    • http://scro.ru/pic/file/1745944643.pdfIn PDF document text
    • https://menu2uplus.com/images/file/98242431963.pdfIn PDF document text
    • https://membermimpi.com/contents/files/76454319160.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613602c86d2d5---69393640225.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/93751791146.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/39427981488.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/saxetifagolul.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/riviwukadezagenoxo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fgl88q7r254a6j56tmpvpser7q/solupipot.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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 17472 bytes
SHA-256: fa913b9088007213320ffe164b108c799b2972b28b6563406fcca31c7872e266
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 10852 bytes
SHA-256: 66d3420034df1c3ea5bda8e2008f18a938dd5bc918070e05af649d8bc784d58b