Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa6da3961d0a376…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 10:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b35e6407739afd17972250ce7560e63d SHA-1: dccb8eeae2801fbcb67a2a80d20221cdf9d88893 SHA-256: faa6da3961d0a3766ea4373b5118727caed8c258962e57d9acacf5509ac6d1f2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=how+to+transfer+files+from+android+phone+to+iphone PDF link annotation
    • http://krajinar.cz/soubory/files/88509558841.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210913230137_9yc1si.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e785cad89b---janisusali.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_B1B5299BD52AFEEE.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/10094362103.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/58892087254.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/tebufeditu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/96203241350.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/goxiruzuk.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/64073888210.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091110054078.pdfIn PDF document text
    • http://ativn.com/upload/file/710455962.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/voremepedoz.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/87148393749.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/nobemu.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/48532078748.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/91ce2107c5df6de5be997a88118ffa6c/nusosapikazozex.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/33878867916.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cfec0da8---mixobijuwonofijukozapo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/72939704842.pdfIn PDF document text
    • https://alariel.be/userfiles/file/sowumaravatoditir.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kuxuduwatige.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/vesito.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/perosi.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bisexalojizakejotebisital.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 10840 bytes
SHA-256: 4c33f73d881b92cf29bfb554de49583ba97745ac70cc2f68b2e2140a5cf26ce3
font_01_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 16836 bytes
SHA-256: 1604ea9d23a68ae4aa5dac36f41f948a4084e81b1b1ba4ae89b1ecd32993479f

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