Malicious PDF — malware analysis report

Static analysis result for SHA-256 313e147cde390f9f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 02:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e10cce07f25498da02f8aaee0890029f SHA-1: 9d4a490dfcf1b65a78770064f347d9a654a80c17 SHA-256: 313e147cde390f9fe3c04f4c78670ff5007ed44b441aab5b021a16c620a4075e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and remote support lure. It contains numerous links to external PDFs hosted on various websites, some of which appear to be compromised CMS uploads. The document's structure and embedded links suggest an attempt to trick the user into downloading further malicious content or engaging with a remote support tool, which is a high-risk activity in unsolicited documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=ariens+522+snowblower+manual PDF link annotation
    • https://rm-parketi.si/uploads/nanoxaribolewefegowu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfdea369b---70322541755.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/97638557853.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/84b3778a118bcdc524ff07bfc6be7521/rewifusozowe.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5f9c0ef41b1663b2a191146e4265b5ed/55794276651.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1628932079.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b671819a296bb20da74581e1c26ec6b1/26418555732.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/jorosebidepakenugo.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/68258188180.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8cdb67d6a4daab8d23519d84a22ca2c4/paliwatiwu.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021081720433973499.pdfIn PDF document text
    • http://zjlytl.com/images/upload/File/34545751934.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/86355372691.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210827_101708.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/70604594102.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mg93n5nap63jbhs17oo6e73554/38987472042.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e28f2018---kukebezuvumefetezixibepuf.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/kifadivo.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/jafomurigudi.pdfPDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bda31ac0---vusototumajusazo.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109031603569196.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/bizefisivel.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8cdaf125aedd851fc18519992baf1589/42119396928.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/69618014808.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/91505236483.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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 10732 bytes
SHA-256: 6467a5ec4ceef8d8dca704cdaed1151e3d25dbb57d54583d993b3efdced7e004
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 17828 bytes
SHA-256: 5f5b8aa5d82250387a9a24a3cdb0248b2478dde3bc28753810b5a800160af03a

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