Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c91d8b07627b65b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 12:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18161f1c7bc921c26e961e38b639b9cf SHA-1: e34feed7aebcc57ab1c3bc3675cc2822eb39ae0c SHA-256: 0c91d8b07627b65b263dac3232b432d06d7e672886b5af49a60f33cd89d3389f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbcfa6ea1d73f11f5e5fec8c4607392b/37312883172.pdf In PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/97732619478.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ukrcbmtboec248ql8vo4v3abud/tedevemederovibonajeju.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/roguwesuduwazalapuku.pdfIn PDF document text
    • https://red-adlay.com/upload/files/pilazawuj.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/2bc7256393517522ff9ba721bac76a81/zenoneduwazotidusesuvorul.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/84456137303.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/xusuvisarukonojive.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/61345817675.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/bifetenixex.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/79583663869.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/98003400111.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ee821faae---23295291626.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1a070b5eae7f060102be80f59b4edbc1/19719616024.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fcca22df2---41700571412.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/dubupovef.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/95cer11b0sjcac391somu3v3oo/49597204254.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fddd68e0---jotukejuvedenukapujoj.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9598d3f7cdb3cdc5a96700ee5b63907f/xomiripagimuvugefodi.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/dozeneranatok.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/46808586187.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/juruvisamefogutob.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/66ddb0226c8f0b9c22137f02c01977e3/pisoxivaguwevizogo.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/8bb612b45238f1a339964aa4ec8b1642/resulimufisiseramar.pdfIn PDF document text
    • http://omg.su/upload/File/46205448447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=indicadores+economicos+y+variables+macroeconomicas+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_off0000b8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CA 10952 bytes
SHA-256: 57a4c8d1b24dcb60eba2f8b32f0c716b09003292764001c71c09951956f3e11e
font_01_sfnt_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 15920 bytes
SHA-256: a0f9b0bc24f1b7d6c02b167fde9ea3663dc5f7d5c22b1134b899c635e02600aa
font_02_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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