Malicious PDF — malware analysis report

Static analysis result for SHA-256 b827f36d619a3500…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 02:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47f3209a03c083573b1a7dd8295425e7 SHA-1: 78c3ba6e7f7bd6228b008ef18c7e0278134ee153 SHA-256: b827f36d619a350013444ec286d1731b96618310795eaecc5802a78a24e33369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://irlanc.ru/uplcv?utm_term=party+candidates+2020
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c867fb77aa9---jupazasetim.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d707f4e3ee522be96083848299332014/xavibifogu.pdf
    • http://lagostena.it/userfiles/files/xikesolivefasijigu.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/dhrgl5lmjq9i9peadahva1ijlb/kufomaduzak.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7ec6bb00---rozeberigozo.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/fba35853e0919623c9114b5f16da6e61/xepebifum.pdf
    • https://netiko.ge/img/Data/file/totarevebenowalubiruxu.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/35375583768.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79f4da99b---70920548815.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4aeab277a---85250850518.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef7288fef---90494111014.pdf
    • https://abe-rdc.com/userfiles/file/sariruxibesureronekivav.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/fumofifukiz.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5e18fb4d---mizutiw.pdf
    • https://heritagecambodiatravel.com/userfiles/file/46829564162.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fd2aedf3---merepakarugodowarul.pdf
    • http://bualuang101.com/backoffice/upload/files/15840157348.pdf
    • http://agrobud.net/uploaded/file/penomizafefe.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cfcb30788---kafedi.pdf
    • http://mtsskzy.com/userfiles/file/55146256750.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160760bc3b0016---41588577912.pdf
    • http://chandigarhdatarecovery.com/files/file/34933276399.pdf
    • http://stacjaregeneracja.pl/userfiles/file/jenezin.pdf
    • http://ricarda-allegra.de/userfiles/file/guxotopodemida.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cjl92ff9rc5ktjh529na3ugvn4/dinibukudozorijosozajoj.pdf
    • https://bawwabatrizq.com/userfiles/file/10808546143.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e7a6.bin
1ff08b8c61c9c93fe1e6709cafaeaea839c73c1242e3e2d07b761d91d5658a5f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7A6 17216 bytes
font_01_sfnt_off0001012c.bin
d0b42617b7b7fa8c4acd03e4c5b8c8627961b4cd1e44cf6c8032aa22e4397ac2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10552 bytes
font_02_sfnt_off0001197a.bin
6ba72598e541ac985f2c02ec90b1266295b304d9404890886b54991511672659
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 17412 bytes
font_03_sfnt_off00014733.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14733 16792 bytes