Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc2a0496ad41c4…

MALICIOUS

PDF

81.3 KB Created: 2021-08-11 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b467a7dd73caec56b4d308f6fb57fdb SHA-1: a001d5ff02962f62890072c69e1c326ba21fe4c4 SHA-256: b2bc2a0496ad41c45fa96af5094896386cfb45df58edb1eb78cfbcdb5682af39
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allegypttours.net/userfiles/files/malapogorumeka.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/roxojijidujowinuwowi.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d67f8418fb47b94a2b8d113bab216bb8/timuxitimotikasob.pdf
    • http://tourister.kr/userfiles/file/73417638261.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3b9da446---10943945306.pdf
    • http://www.hmcpacking.com/uploads/files/titakejavinemunob.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/10140825449.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j138llgej91s19cad8eumo2eqe/16260104566.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8c0745d68---xatapunelu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081714e8b65a---32421412729.pdf
    • http://tajesink.com/Uploadfiles/files/96729294391.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qbhnrnqtqb0on69rs4eim6op86/temugimu.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c15f07f5---76348577710.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/gufolegosibuw.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/27237678667.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c29ca2dca---renibiju.pdf
    • http://leton.pl/userfiles/file/81752807656.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cb0e2c155cc79f99cb75b5ecb03eb3b/26532297000.pdf
    • http://op-gold.com/ck_image//files/42176801999.pdf
    • http://bobmeetin.com/media/galleries/files/vigonufapo.pdf
    • https://mamap.in/ci/userfiles/files/rinaroworuladovewum.pdf
    • http://sloplast.com/userfiles/files/fedigerikugusem.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d01073101fcab42e0c95f02e41ede9a8/xiseraf.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc05badfec---90654884553.pdf
    • http://rcsiprojectracker.com/userfiles/files/28765112825.pdf
    • http://daonshop.com/files/fckeditor/file/wigemomemozubixebimude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=point+blank+g%C3%BCncel+hile+2019
    • 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_off0000cc26.bin
ed7766822dc421e7cd1a79ea7202db59ca5bb37e8b4dc1e59261edf8f4290ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 23040 bytes
font_01_sfnt_off000102e9.bin
140fe8ef849e6a2bfe08c45352cc4ae6fd4869b2ea15f9b2d89555f079896713
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 11128 bytes
font_02_sfnt_off00011cd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 16792 bytes