Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ba56b2bf7a90a7…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 07:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 684bfdf44812e8b71b1475456c96a8ac SHA-1: 43b4682fd8d87ac849692ea40fe7214fbdf07b09 SHA-256: f9ba56b2bf7a90a714125f0684cb88fb919d915f88bc74efe92c3ce6fffef1f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7d96708f9578de7ed6c91f6e9c937074/ramezabilajetoxovirefara.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792fb84a7bd---10811168452.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/44g4nsjq5o75g79mf1pcgdagh3/modotasigapikidesitatolub.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/12280271667.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/fulaxibawexer.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/13063707434.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/xowowavowinajanorunew.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/35352691868.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/28097754515.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/80151554411.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a164fe61b3e---34853112687.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/51322785007.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e39ba87180b---zazamoxumuduxotejemej.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/21056296636.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b0a3442e45f3bacb070ea1e36920658f/35719094960.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/befor.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7a9d31e76---22774414488.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/busawo.pdfIn PDF document text
    • http://metapolar.hu/tmp/tiwolakukurijifopigitel.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/dugotawuvuvaririzutodosaw.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108070818524248.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/rogujadudolujokiso.pdfIn PDF document text
    • https://cet.sk/res/file/81998711873.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6dcff757be4861eb8bb89ca2dd9a8985/9418447753.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/80953097703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=crave+you+meaningPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/jegafudeziwatekufiwi.pdfIn PDF document text
    • 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_off0000bf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2E 16780 bytes
SHA-256: 08f8ad869c8a788827e6b680246537e8165448f9c56a4fe3c253f2f1c53652d3
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 10452 bytes
SHA-256: 4ff946cd4b57e7ad92aebde57002f36fbe88a016e1e0bff1f18fb4826e7a228d
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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