Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6422a6fe84abeb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 12:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b0ccf84a8267e58d8b8eaa48bc6244d SHA-1: 68536bbe7799db0384c7c8a2db1e951ee1d82b0f SHA-256: 2f6422a6fe84abeba6acb9459ca046f21caa383f5b9c1d6215ca13f4c9527d92
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier strongly indicated maliciousness. The sample also includes numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 https://chcial.ru/uplcv?utm_term=download+soft+key+apk
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/lamobovawaxipudebik.pdf
    • http://szjwwj.com/userfiles/file///texekuxexesul.pdf
    • https://maconlux.lu/userfiles/files/nodukavulizuwibez.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/wazujunafawuwujizezazu.pdf
    • http://zhihepvb.com/upload/ckimg/files/202109100005571309.pdf
    • https://computerzone.pk/file/wajolewexekegudemuxaxabi.pdf
    • https://muratay.nl/userfiles/file/87935114077.pdf
    • http://crmloccitanecr.com/campannas/file/wezikagiwezexila.pdf
    • https://vinasimex.com/uploads/file/52663564272.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/wakuvojafod.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309a3125917---13316008194.pdf
    • https://vasantviharproperties.com/userfiles/file/96860079135.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161434b5bb76a1---87463713517.pdf
    • http://palazzodiaz.com/userfiles/files/63687535890.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/vibitufifidefalumovo.pdf
    • https://korovin.org/site/img_ufiles/biwexufupiwalobe.pdf
    • https://shian-jin.com/UserFiles/files/20301247531.pdf
    • http://kapsalonvogue.nl/files/file/64779538740.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/galewapufedokitowiwalelux.pdf
    • http://tomaszfilipczak.pl/userfiles/file/26981839528.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/mivoxosafita.pdf
    • https://jocafoto.com/fotos/file/tixek.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa5e00151---sewezalujatemebisu.pdf
    • https://latgalesamatnieki.lv/files/file/lasuwi.pdf
    • http://seteo-dechets.com/images/file/fifilepiseziniduvuluto.pdf
    • 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_off0000df9f.bin
0b0b2d22a6721de695cf7ce47020bdb476a10b70617a3a4e3df9d5ac21d538ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 18300 bytes
font_01_sfnt_off00010fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 16792 bytes
font_02_sfnt_off000127d5.bin
c33686696251e366a16648e0542f9836a61141ca6b2576ab670ba7dc594049a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 10592 bytes

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