Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a99b03ed1d79793…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 06:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47fe1cf811dcb5d794263c2db34e89c3 SHA-1: 9d0a45e484d942e65ccee842e51c2f43bf2be1fd SHA-256: 8a99b03ed1d79793b0f389d2713cce3caabcc0228311ae0ee60a3bb6cb35c626
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of numerous external URIs and link farms strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=install+rdp+on+kali+linux PDF link annotation
    • http://anhuishangbiao.com/upload_fck/file/2021-6-11/20210611062526962586.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/bojiretimorogumaxusuxukex.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/28069385937.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/70218918aa0ff68c9f4161e916af07ce/28940104988.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/90039518581.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/40324494942.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u1de6ms0e323b92bbktpghtdab/98010464022.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611860d10c5f4---lalutevo.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/wosetabu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607950d99af38---95759936094.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d637cac22b3---dires.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/89949592917.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/69lg8bcs4q0t3507jp2sal677g/42684379041.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/dinibapipusipu.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/xojapixekejokedurolas.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96362708008.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1fddcbc1---62325503815.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/34308627583.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdcf5f6aa---vanufapezazemidoviniwe.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/23595410568.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/897t2i73btobaa03si69sletg1/gifozivad.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7132df34d4---12733669435.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ab192a4d1d9c239c7750c001c36d02a1/baxunososapabewegodefaje.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 10500 bytes
SHA-256: 24429abbb4d948294299a0ee003fb7b78f40b87057e02577dcc8deec39aeaaa0
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 17744 bytes
SHA-256: 1cf5fc9d08effdc725a59115e59f9b4c125bfb59f15e889290735b757eb3b269
font_02_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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