Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f16967c44cd3b6…

MALICIOUS

PDF

87.3 KB Created: 2021-08-04 03:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc707552856a1e1bd37e9d889a5158bb SHA-1: 570fcf40dbb055c808074f26d1faedb699a22b1f SHA-256: 18f16967c44cd3b6db8121ca6a824acb42f81e8fb3acf3c11a26b786a558d249
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ahcxdq.com/uploads/file/090019538175.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e22fedcf2---52206085436.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vju680h7of4ivof30nael7k9j5/78518197488.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/75519324475.pdf
    • http://masterref.ru/editorfiles/file/tuzenojetokegenexusudivig.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ab6152ac---xujizamizuw.pdf
    • https://hospvetcentral.pt/site/upload/file/65890710008.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3bd6f7eaf5ed44853438bca4a45a97e8/30428229981.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/683ffdf1c26da64033d61ed85cdc9d01/80220413994.pdf
    • http://barudan.hk/UploadFile/file/20210629020903135.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/abfefec9d41bd150812195534ffc204a/pikunosenuzowawi.pdf
    • https://mashura.co/userfiles/files/zoboxikum.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12e8793448---68296917383.pdf
    • https://underworldgear.com/upload/users/files/50040340579.pdf
    • http://studiospazioambiente.it/userfiles/files/matekarunofu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735fa07e13---56894012743.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6d2t1rotsl9q15b8vtua36ugo2/61061179797.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870fae9ef7c---kuzebeli.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/81343251561.pdf
    • http://eko-inwest.eu/upload/file/31493374194.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/032b2b24a7f609afee4a1c6271ba5eb4/32219706810.pdf
    • http://goldartline.ua/userfiles/file/pumobas.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb4d41599---64634014807.pdf
    • http://zatexpress.com//upload/userfiles/files/81912754656.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88848b84a8---pijuwizi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wow+tbc+rogue+lvl+guide
    • 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_off0000f23c.bin
731ad08d3d5dc5fd932f9003834b7a10971ba29049b0c95a59ac70a3646e2ae8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 10496 bytes
font_01_sfnt_off00010a0f.bin
47058ff617f52f06d67d37acd021c6ef7cd934fab7449331d1c1aef6012d5990
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 16908 bytes
font_02_sfnt_off00013673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13673 16792 bytes