Malicious PDF — malware analysis report

Static analysis result for SHA-256 e849bdaf6d24d8db…

MALICIOUS

PDF

82.4 KB Created: 2021-08-19 07:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 684a1976c0aed1f7908bc56f7eadaa7a SHA-1: 07bf4819d5ab75346765c6568ec6afba7f562ab3 SHA-256: e849bdaf6d24d8db117d1ecd902e1b0ef1f42acabbcb6ec66d4c4571279df04a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs that point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or distributing further malware. No scripts were extracted, but the embedded URLs and heuristic firings suggest a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61026ee44---425263984.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fad682c28f7---78659286794.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/midipowupefomufibatejape.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202108161131053732.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec77ac765919f8e68d351008ccd4f909/88866820476.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/nidibovejitoxofotu.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zidogusupukoz.pdfIn PDF document text
    • http://accronline.com/userfiles/file/37546976667.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/21259970593.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2b9c74710---babebamegululiwu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2bb0bef5a2f5583238d719b9bc7b33a5/wogakavuwaninekifusuni.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9dc3f279dd73cd15845e05e2052019b/gubatobusepotudaluwavali.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3f9266dd---kewor.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/todekakuzedamudur.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efefa6d034---limisotuvix.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/nilaweva.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/takanure.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/kokegufabeboj.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/vipomuge.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/xumaf.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/431d05bf606000adccd9fc6e97875fc9/6078386519.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3c9982742fa76e11f36515ec1c57da3e/bulopezaxitazolivefama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rhetorical+devices+lesson+plans+for+high+schoolPDF 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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16476 bytes
SHA-256: 054e69b8c95fa265770d5ccc8974c5cb95813d5486d75b8ac5df30dda0886eff
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 11008 bytes
SHA-256: 8027e3b3a582190c1e8c071c601485f43c87922a8db3660bf913709d730010f8

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