Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b040e86eaeadb9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 23:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70087d413c15b7ecaba463c5b8ea33ce SHA-1: d4603751cec2b35d9778427fbbd713d3b7207fa4 SHA-256: 22b040e86eaeadb95c4743a8057f6180a22a0eb6631f227db91cd7a8b814acde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://tecnibat.net/uploads/archivos/jewavijenobesenoja.pdf In PDF document text
    • http://gtshotel.it/images/file/kozeluf.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b654e2297---jodipepozalowisimusutofuf.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36fc4c7075---wojegowijegu.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/lebero.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/80748534889.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f883bf78a---vofarula.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c24b88a66565409c40f2a9917b32cbdf/71342836720.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d3f893dfe3ff2a6d9d4f19106b97090e/ximeko.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/93e4e37116406430d9e7276ca9731817/bunivejimejaxozuso.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/2185070528.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822da55ad1e---72873564820.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/85838580313.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e9b0881f079041f025a1d51371580503/defowawotezinijibepob.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d48866de---42874068567.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/wedeniterawinasixibaxo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b143a916a93---fujewesukuzabema.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ce7d0695---bababebedule.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/sisij.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/966512ede85d8baa7458c52f7bab302f/xesusejutolusa.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/motuxovujibuzorigoge.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/87087279788.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/58680765143.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/winer.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/10872650561.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gapiluwamovuzikozapidi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0ac98211e1c5036fba1abbdf9e3498ca/vedepus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=craftsman+riding+mower+manuals+onlinePDF 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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 17872 bytes
SHA-256: 7aeb9eefc158b336c7ba1ded621222b99e73740277a6837283ac082be3803802
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10916 bytes
SHA-256: a5da38ace09457e9ae8b8a631d65ce7862df48ee3d8d809d768b7c4f039a511b
font_02_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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