Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39161327b20dfb4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 01:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50056f59d7dae0a79fbf5b0d54e04724 SHA-1: 8a390d195427210912a6ba9fa6942d86e89cf6f3 SHA-256: a39161327b20dfb4aa266fa92fb2405753c1bbb2f0d99ce62a0e9c0590dae069
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://abwvictory.com/uploads/files/gavupitoxokud.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/gifiguf.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/34554f5f81a8277ebbba3b83cd1ce968/lofewidisaxi.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/55shhq7d1ogb47ml7sgedcb105/45125915664.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/a55tdni17uggcj0hc7cflolkjd/kuluxesipovudosuwebifuni.pdf
    • http://massimobertoarchitetto.com/userfiles/files/21722385933.pdf
    • http://guides2alpes.fr/uploads/file/40084683531.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7c3bfcfc25fb58f337183fa18752b638/radigaxifu.pdf
    • http://hondasushi.com/uploads/files/jokininukuje.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/85d28d91b2120cd94e44d7f2281c8c78/xafolisalizufegokepijuj.pdf
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/mifetixanugexuvofivexujet.pdf
    • http://starrsgazette.com/admin/images/file/64157912363.pdf
    • http://thermcom.cz/userfiles/file/suxowuz.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e66846cf93b2b4b38c8f1e5b44584f42/46720395510.pdf
    • http://lsphc.com/userfiles/file///wegimevujapobuvezotop.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/363d7e609084ee105bd3ea2599c73dcf/pegawuduvidorutibewajezul.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rajalamebikewegikaro.pdf
    • http://quick-thailand.com/images/uploads/file/mejogebegiluwege.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/60dbc149ee171738e2d5e64bc79383c3/delokajilarazat.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/d1372e2ef7e4813988df1229b222fde3/41298268626.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/tgg99rfug5pl3q5hb185bbv768/6680177542.pdf
    • http://eurekaelearning.com/upload/news/file/jukepipoxasam.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pi73iqnu4h91kvktiga1cnt8j5/tejevi.pdf
    • http://arohitourandtravels.com/userfiles/file/jezupibarowesusoxapireli.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=iti+fitter+hand+book+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_off0000c5e3.bin
626042a61a56e94a31a3cbbfecea5f9e1ce53a7135f961c71b59634db3c24520
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 21084 bytes
font_01_sfnt_off0000fc9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 16792 bytes
font_02_sfnt_off000114b2.bin
de2d4a3e3818021b5797b35ce2e160e4ea8c94cda90987e3c2df627117ece24f
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 10564 bytes