Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d31052826072fd6…

MALICIOUS

PDF

116.0 KB Created: 2021-08-03 19:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b151935b67a6e0b00cbd7b8e50e1371 SHA-1: bfece4dcbcc1476405566ff5c9bc335ff0a20547 SHA-256: 8d31052826072fd6f42e161500dc4c26a80f6dacd5b34b39f47aea92ab511c5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dentalrud.com/userfiles/file/nixijanoxuto.pdf In PDF document text
    • http://arslanemlak.come/file/masizo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9cd1dc586fb09fab350a75edd2d2b046/5837152902.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/gogoti.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/97367577879.pdfIn PDF document text
    • http://ud2-140.com/files/33429353638.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75f6c9385---78572383350.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/81316109156.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c69222826---rovoxuzajiwafukaba.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/853297034.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9b833f6fd31c2b6277d71b297350c52/27115257627.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/91190800533.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/bilikivatomitalaxig.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071702f3f95b---wuguladol.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/81248694589.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/2be7b286e59f40da87c9a5d8e18393f5/68230129796.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/0b29b2bb3d8a0c40373886d2cafb6083/werifepiwefezit.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/27669983090.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f02b0be0---47862409802.pdfIn PDF document text
    • https://telenovella-bg.com/files/vilexupa.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/mebelubok.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/90752617836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=libro+de+matem%C3%A1ticas+2+grado+hondurasPDF 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_off00015dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFD 18916 bytes
SHA-256: b002aa10ae001f0a587401ad3306ca2839cb2e5871e05c17a2254700a492ab7f
font_01_sfnt_off00018e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E42 11268 bytes
SHA-256: a93715a673f68a03d3cbaa12a5e8284242516d59f9edcc4e977440b19309ba61
font_02_sfnt_off0001a7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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