Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8e9ed0e2c31963…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 21:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84793db532a8a3e09f3f48e4e3b0614d SHA-1: 877cd38c33d0e28db947a91d0f5e3617b5769595 SHA-256: 9c8e9ed0e2c319638230a686c0959dbdb1748c09355ee5da4249af77db3828f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9851a751d1b1ef7750445ac46270f1c6/77201378489.pdf In PDF document text
    • http://skene.es/userfiles/file/xugubobopowenodesowesuju.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161418e75d79c4---gozuma.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/24437204156.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bexitubop.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/soxurafivereniduxuvapu.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kivuwezusepixatezagox.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/69473702537.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/92020308542.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/gelotogowuf.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gatejurifadopefupenaposow.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/rajabazojepif.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/rivaxofav.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/vufazexudafomurese.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99f4ecd6b224ae083dcace8e92ecc617/49559456460.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/70237338565.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/581f6693fb78108b969ef2f5375421a3/febexavakaniluguzovun.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161470c4065f08---92434522372.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/motolurisagiwerejurilen.pdfIn PDF document text
    • http://tano-cable.com/d/files/26910224260.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/jopojelirokiz.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/43967994431.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/dumazuzogi.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/17449929774.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/24596905494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=voice+changer+on+call+freePDF 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_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 10320 bytes
SHA-256: a333270d7003a91332665c425c50c9b32ca342de0a5b495e3fef339bfc6aec1a
font_02_sfnt_off00013bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 18136 bytes
SHA-256: 93c512b97ec628dc8222531e383e9aaba16fd699ddeebca083af5a4f6a828b44

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