Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a21260883bc85a…

MALICIOUS

PDF

81.7 KB Created: 2021-07-04 14:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 338d554058ab22b0af81606e026debb7 SHA-1: 1b873105023ee7b90fced5063f7f3904a4894611 SHA-256: a0a21260883bc85a78d42e77932175975c2cf0b47b277990c7475d5e19d9ea0a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL distribution are indicative of SEO poisoning or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://marinapogon.pl/upload/file/garekadinigixitedebalumo.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c651d9bda5---74271450037.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/8655290254.pdf
    • http://libertyquad72.fr/userfiles/file/70274418068.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d280eb59fcc---daxemiselonexosejuravo.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/wagiwogup.pdf
    • https://nbtele.com/en/cache/fck_files/file/30604637393.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895f2b1aa8b---tilemedawu.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/57267791436.pdf
    • https://ceral.pl/ceral/pliki/file/fibetigazizipujako.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vep7pq2gu6iuv09bdr7od2f4fo/juvefotezomav.pdf
    • http://kangs78.com/clients/66216/File/91527549507.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jbiunpr5j4vsv0ans47175scnt/depojon.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkn2d0ircdfmcdicm36riuki39/pabod.pdf
    • https://tortugafilms.ca/adminfiles/file/dorujopodexoxugumasobasi.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/66497379669.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2dmsrcrcto569d7lobt4cotadv/lukepidulivukuxesonoritu.pdf
    • http://zhengfutz.com/v15/Upload/file/20215241616486109.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/vijuxizaxewep.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a92818e9989---23147091114.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1e351f0add14031e75cf12e4ac881d2a/nexonexofizefoma.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7c7960ea71fb22ff87206ac7818278eb/41200152530.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q8fltohiamdfe5nbp74d9k5mn2/lezaderi.pdf
    • http://architettoseneca.com/userfiles/files/89155645840.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5b09ca30---zuzitalamigisizuso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sslc+kannada+question+paper+with+answer+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 16792 bytes
font_01_sfnt_off0000f2eb.bin
35e2221b3f0588ff5750f6ce12358ea541754e0f4f74e1b63533b2338a7d35ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 16736 bytes
font_02_sfnt_off00011eb1.bin
7ca13841d1fea4f9faad152f13e8ec2e49b49d80e8d9a9e945450e0b57d53630
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 11352 bytes