Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4620f14aa7b63d…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 19:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ff6cb53adfa501217a39fe0862a84bf SHA-1: 52f598505950e43f3b7272b0f4fb5b8fcb407d02 SHA-256: dd4620f14aa7b63db1dc723f74516be72710efd30b37e772d0d0b36084824caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF's structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=brown+haired+male+actors
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7nl5lifocpd4mpjkhdmr49oq3/vanaxubiwetarepogazegawor.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dc4543c38---70933402414.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160756e6d5ab20---65520488371.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160aee0c2e688a---91225929589.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429104224256108.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/10a6f9dd6b262ccc3ce9d0c454302d8a/kijifulenovanavonodoj.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/19115431371.pdf
    • http://ehs1958.org/clients/73155/File/safavujuza.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/dc0f78dfa9a30328d3befefa2f7e5b61/85969817279.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ba6cb6f3---32361151089.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dd69c33f---92115079966.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3f47c25b---76821378008.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc0f3bff08be8eea1de916141ad4a447/49385952247.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0a5aed4abde2b1891841f2b5196e4cd6/20227595806.pdf
    • http://otvorene-srdce.sk/userfiles/file/legudepepu.pdf
    • http://samuiluxurytravel.com/Uploads/file/44660211848.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/zasukorof.pdf
    • https://alutat.com/data/file/3132872583.pdf
    • http://10glazsikeyrosa.ru/file/41263300331.pdf
    • http://akcjonariusz.com/UserFiles/file/47342742593.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/56058d017c29cf12cbfb2ab6c7d56ed7/jokamuvuxipaxedakojapuz.pdf
    • http://etabetasurvey.com/userfiles/files/wofinu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a89df53fb4e---puduwawebego.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_off00010012.bin
8c14dd8894536afd791e71cc70b6f67ca89510d0e8db64c1b390722532d03130
pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 10772 bytes
font_01_sfnt_off000118c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 16792 bytes
font_02_sfnt_off000130d2.bin
5584034890a0325946a2ef9cb1c5db843197211d412f016e30e091f7ace023ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 17316 bytes