Malicious PDF — malware analysis report

Static analysis result for SHA-256 734475cd8f8491a2…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 11:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bd94edfff23181158489bcf4dc66563 SHA-1: ab1866bc4e34cf936ea59ac90c9ec373c7157c61 SHA-256: 734475cd8f8491a234aae32f6832b6bd689ca5014552dff99660ffdeba19f573
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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.
  • 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://skkouty.cz/ckfinder/userfiles/files/15622699189.pdf In PDF document text
    • http://uchid.com/uploads/file/koveniw.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/15884687384.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/95444220189.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/24746397302.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/8533155974.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/rokalotitebuvutaxi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba1a369acc---wawuwodivikid.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa7f73b4f---bewisufixuz.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/pumogelepogaji.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/77826469794.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7eed18ea---91025915563.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/54108919186.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c02f49658a---fujufuvamemujudefetodat.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/suritanixax.pdfIn PDF document text
    • https://aneri12.cz/res/file/wuset.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091021174689.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/rixobipavobuwetozax.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/73918210676.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/likenu.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/49957786576.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/panib.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/70031960733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+app+studio+downloadPDF 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_off0000b2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D7 15636 bytes
SHA-256: 0f481163e73bb465d9d5320fe366fe5a2b1da674fde597f4c59c977e3579896a
font_01_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10420 bytes
SHA-256: f5f049029d06cd5822bc1e514572d32902f2d0d7e453b761311ddda5987a91f8

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