Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae8ebb624bf11a0…

MALICIOUS

PDF

81.5 KB Created: 2021-06-27 00:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 00acf7b03f3a08a8ac9f8d9488069351 SHA-1: 40d259566012bbb797943d0d4e78d8c3bc31be45 SHA-256: 9ae8ebb624bf11a0004b945ee9f6e0c926626832b4999d146f80797259de4c89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://medvor.ru/uplcv?utm_term=hey+i+just+met+you+and+this+is+crazy+lyrics PDF link annotation
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/4ccbe8caaf37fa93743b8dc6ab003839/wujoniwotav.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/wokajidomonozatemovora.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcdd33b7e---45181621904.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/sujokudewugorudab.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c0639a8e9a1c672c04dbd9ee55231f34/dobitaxota.pdfIn PDF document text
    • http://standardamulet.com/files/files/poxawafaxabiwex.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/38216884443.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/dibugeparosobupoketirowam.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/41707409230.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/34078476915.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/8a0dc541833b9e48fb7a548e2acbac18/11457735430.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xotolejaneji.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/d65iqfrgekfaq8l691t2289t0o/88790333143.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954983dc3bb---bedalemimajonalavapusi.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/raliz.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p57o93fev1ghe35ptgfoduulam/45551536837.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6057759275---jikadusakil.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a28c1d2858b5db4ae8a7b712c6e2d489/80648985970.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa236cf8f---66725419551.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qmck9lir3norrsh0t9d1k68ptm/63044290053.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/tusigakejinelof.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607987ae314aa---46490184455.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863cf99da0---4439537569.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xupifanonuv.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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16812 bytes
SHA-256: 32f29da3db8d61e910bd5eca8a7e4958afcbd26d4d09be093b1410c11de1d700
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 11032 bytes
SHA-256: 0e86cdafdf811f485035501afe35458ce89843863142bea2d2196cf3a73d21f4
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1