Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6dd0c8d2cf8c9c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 04:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73cdd250d7634ee8059e066b444f7e07 SHA-1: 48add39bf607462e748d98d4fb09f25707dc2e61 SHA-256: be6dd0c8d2cf8c9c1a8266d67ed326c787764e5c5fda4050916acb67eb642100
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d83664b5a0---75576349885.pdf In PDF document text
    • http://slesnick.net/userfiles/files/45540510169.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/5346252267.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/84727659287.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/xojun.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109050000203869.pdfIn PDF document text
    • https://ottopianos.nl/files/parabuvowasezejesubalu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411de5f0205---97400088527.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/k82t0fa8mnl36pch96nsg61ah0/44121957124.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614018e75451c---59828392630.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/gozazezubinoximufolo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wotitotorikur.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fuwotajew.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/28999973949.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/87897424061.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/n8jnv52iv9iej9ttsegh0c2ii8/26068818790.pdfIn PDF document text
    • http://adveotec.com/img/file/15398060320.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912135224577742.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vujegejotuwe.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa25513a0---25824616279.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/15975629717.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/xuribub.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613512edd1ada---javorod.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/82223419940.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351fbbd9ac7---81963828627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=persona+4+dungeon+guidePDF 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_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 17236 bytes
SHA-256: fc6b4145638a5306947ed5ee25806d368b317784e9d3a854b2a5fc2996b26d13
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 10460 bytes
SHA-256: 9f74919db0f9eff212da2eda17fdbf4205a7ac35270446e90fef5293fb739a04

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