Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1da7833d5f719aa…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 20:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8396a7b7f4003bf58334d00bc73e1a0d SHA-1: 152a838216c9ec212ff4bfc8ecd46f928abc4d43 SHA-256: f1da7833d5f719aa65be50675ffdef6027399424b54a4d38d2da8c4870bbd901
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests a phishing or scam attempt. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://easy2ticket.com/upload/files/73770738126.pdf
    • http://haumeaonline.com/userfiles/file/39427755150.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa339cbc5---serobitemuluxadekavu.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b0268e7bce5ba1845e448c4b173d85d6/9534835200.pdf
    • http://surtek.biz/image/files/20150130_011208.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/85941269191.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i6ij9ushab3d9o5puhgo0rjh6b/rejedotuba.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16089b41b3dbd2---kagigunizolenizurimasid.pdf
    • http://cnokorea.com/userfiles/file/19432791654.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddeb17c526---12191125771.pdf
    • http://sahrugs.com/userfiles/file/ladakenoxadukimok.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/90284941016.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1460e8bce009477e0ec3d3ebb507aa54/xaxegepubasugotulofofamo.pdf
    • http://thunderstar.cn/userfiles/file/20210626111154824398939.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/70718146102.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210624_A70F9694BD747ADF.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071670a535a9---91503669786.pdf
    • https://faresaldabbous.com/uploads/files/mekubegafetimefafi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b954e2171---93210452437.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987d11909ac---natezogupuwi.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e192a436a---faletanasixidevozuxoba.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086205b05073---67684734132.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=survey+time+sign+up
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85f.bin
6141695da91d3f5f8a6595fc245636953081813ccebe0afd6e722d91d9c6e73c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 17416 bytes
font_01_sfnt_off00011616.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 16792 bytes
font_02_sfnt_off00012e2d.bin
0b9a65c5801c0d230086afe7bf64fb864d5fa1e104e093d155c255c4e6c13d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 10620 bytes