Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfc1d4d32a892dc…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 00:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d3e62efe07ddf8faa362d95b7aa7b16 SHA-1: 9feb19b1003a11f4961184eed297d0fecf9db57f SHA-256: 1dfc1d4d32a892dc761a993ebdd5616a8251d8fe5005c20735783569e2e7618b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, embedding numerous URLs that point to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=subscribe+button+gif+download
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1765b0040caa60bb87cff394690e9c69/80025108851.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ukjgpqenio9021207hqi94m7ka/jebezekap.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b974f6cf---37207407001.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8u61b6qv8q0994la7b0u5vgfk0/gaketaravozumuralafiso.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55cf58ada---fuvivop.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1v8ockm6gg0idje7lsuardn62c/libipowizawakokin.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d67b6ad0e3b170b4a1311aba461c8d62/38948535952.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266b337599---tamixokabamalaxof.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb38a0c68---82304017635.pdf
    • http://idroter.org/userfiles/files/kelop.pdf
    • http://jjmcp.jp/userfiles/Image/file/63233494129.pdf
    • http://gyobel.itpublic/file/mugugisuf.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d81937c5b---10075184860.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0edc856c---50025925136.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae18d243e9---94139582380.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaadb9b4b34---27284880551.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4b1a09d7---wamusuda.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/60c7fdb9a3457ff0047454ce4e3b7319/tugedanixinajon.pdf
    • https://debcopharma.com/userfiles/file/vajivonobakerala.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810920926db---63193649891.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kavajivupujire.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/075d15acebfad7f6cbf03e4754931894/fakikegofikevaf.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/f49voqa02os5bofsav9s8rk7hb/gajepikigufu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882f0d4b88a---24053968357.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607349143f1cf---bujibejapapawakej.pdf
    • 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_off0000e727.bin
ed626fbe57a1b5bc9a78e9c1657c6815fdbc57393a763c927500abce609ce03f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 11052 bytes
font_01_sfnt_off000100dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 16792 bytes
font_02_sfnt_off000118ef.bin
24f02148dd45074827aa41651c352d034bb9a3f315e3ceb4d3e6d017d7d711b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 17204 bytes