Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55b7e4b18f3129a…

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 21:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 248422fa3d75442e61a671001065f320 SHA-1: 4364fece1a6b7acfa5eadef6591a689ebc9352f5 SHA-256: e55b7e4b18f3129ade49aa0d287e840f5c78ef1db46651c1ea14fc88236bb9d5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01a225789---xixapirazokuponevuf.pdf In PDF document text
    • http://allycatering.com/userfiles/68772352584.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xeled.pdfIn PDF document text
    • https://shidoremicrosys.com/media/42634870194.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e506d33531f5cdb6e9f02d3e9a98dff4/varobajibireviwidubonob.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n45g4a4hr5v1qbq2b6spduv68m/82754815653.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9f413a91b5c4feb421b5aa1c7d1ee3fe/9099317417.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/zububarukijenokasipumam.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/17907909246.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/zexawujuzozuga.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210901_DCF317F5AC178C72.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/20059778106.pdfIn PDF document text
    • http://preiss.at/upload_files/files/lulubudamifuwimerekex.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b486d3d19---gidotoze.pdfIn PDF document text
    • http://poiskvod.ru/images/file/45142452361.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/82256247684.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161377b54d754d---15148634369.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/13830918066.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/33216768336.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7d719cc2---96069682072.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/74373347884.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/74355463055.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/30209326553.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/93666506039.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/62438198900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tagalog+to+english+translator+with+correct+grammar+apkPDF 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_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 10960 bytes
SHA-256: dc953913efd61c890fb617e3d728d7c118b66346ceb7b311f5aeb77f5fee18db
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 18524 bytes
SHA-256: 08994ed565068084d51de834f848dc703b5ecd26772103a95552ff5e6d034016

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