Malicious PDF — malware analysis report

Static analysis result for SHA-256 421f05281d0b77ac…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 22:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 770e4a86d21d49d69ea4aa9589be8dec SHA-1: 344ea9dfe2b3c272900080be8f7d060a5aa13086 SHA-256: 421f05281d0b77ac9743cb8fb9b98a8f8d6fb594bf7953dc54e8728afc120a04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm used for SEO poisoning. The presence of a 'download' button lure further suggests a phishing or malware distribution attempt. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=collateral+management+agreement+pdf PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edba34e730f---kiwoduvonaxexatu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe665287e28---33133320765.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210716172106.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210513050251.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/48759197376.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160862962d2f10---71610785953.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/nalowugezuzubuliko.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/29990776799.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/kegodor.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16129536b13b93---jopawexemufijoviverazosor.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e2ec7788---23283791473.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7e12bda301d4c2c03e80fe87df8f1665/jakesosakozozegabal.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/odesimakibetinoweduma.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b43b4d268b---13654335261.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29b09f9bf---xasup.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079002b5f123---62162834318.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/85386823971.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/lupukaxoguv.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/waregevabapag.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502222304115597.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/jibatanidojabid.pdfIn PDF document text
    • https://elemonbg.com/Files/File/juwibolorapawiwi.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/86139095576.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_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10612 bytes
SHA-256: 5bb2e640a20f7a7e9ec18aeacd44af89960e1e8ea6088e308657a0881e0dcbeb
font_01_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 18328 bytes
SHA-256: de060eee44c759535c2c6f4790b09716b4960d3f50da7b7e0bddc44532e0ec38