Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd9593745f3e44f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 20:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a57331f3f756a439a1bddc91ecf0d24c SHA-1: 1cff413e56cce34e49e642733adc31798dbd1f1a SHA-256: 1fd9593745f3e44f533b313edd681f711af601855cb7653cf0e2d6523d0a2d34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd180c2f2f---fuxobes.pdf In PDF document text
    • http://dienvietbac.com/uploads/files/97772501526.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5ef1a144---18322054043.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/bemifanowapabudo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/vatobijunojamoroz.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/35c90fe333ac9c276733a3749fdf4cc4/13874248029.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/papipupunugikune.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/24060526260.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/54402993754.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4f3646b9---gumakopetijireduk.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/7d511141855b7bd4745b2f549c0940e8/20794439662.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/84948499835.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd91e33622---wisira.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/wejojidejimaz.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/140172938afbe346b80d18d2ee7558d3/xilobuwefobowumesonasiti.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cf2c17fb65c73b8ac707ffcc3288b1dd/53590709319.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/75042624112.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/tigapar.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/foxesumovogesubaxirubus.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d00656989---vodibamul.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d7c8aa00---balerimizorumage.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acc93d3dba7---36661788207.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa2c98038---poligixavodamemopu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840766df38---20422059463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+printable+nouns+worksheets+for+1st+gradePDF 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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 11224 bytes
SHA-256: 7474b3c3a60503fca6686ac17b6e5d34a1adc01233e5c0fa38d1ec001db29e28
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 17384 bytes
SHA-256: 14805138abe5cef452fe6fcf9a2df78fca552176caef79aed6e6d8405aec4af7
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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