Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f5859e23c0c5a2…

MALICIOUS

PDF

78.9 KB Created: 2021-06-29 08:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c4534ff15660f35c9b01be682d51336 SHA-1: d4f487cbc3f1b853f844f945df7a051e74150f4c SHA-256: 23f5859e23c0c5a2f17560ea14f8ffbf203f0d800dec248df63d0b8a853767dd
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 websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5jn16gdsteotev460nclppa1lq/malivawenebiri.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vb3pdreh8tdujcggpv4h1plg6v/fiwuxusuwonunuviwawox.pdf
    • http://consade.com/userfiles/file/sisinolunarenefenakoso.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2ab5889f---rifubenagunejifuvakis.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd1cee8f19---66913719324.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/05fd3664faaf764b57b0bf4e9040660c/zaserij.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/bosokinup.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ed64660e29f538b1728fab02b531e64b/21204765719.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859dab99eee---8426271782.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ot1703ka7fvo8v6miu9g1qf8u2/85026442835.pdf
    • http://aqbnb.com/uploadfile/file/pokodavepixigevijuje.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1244a4f9ec8c16c1a62cbbe39854aa2f/70983604862.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b43d6fed7fe---89466170112.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f0b84964---12934544529.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f248695bff6793b21a40ca759c36f6f8/59838268332.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff877f2e0---retemida.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6e10a6b499b18f281effdca8f33c8542/pinizekipupe.pdf
    • http://saatgaamkansarasamaj.com/admin/uploads/files/91624790393.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954eb396fe4---kipixelewevojiwan.pdf
    • https://chung-pei.com/userfiles/file/13359656628.pdf
    • https://ntwbearing.com/UserFiles/File/tumadizupamemozi.pdf
    • http://billedbutikken.dk/articlefiles/file/badavi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=powdered+sugar+cups+to+grams
    • 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_off0000cc73.bin
eb2c5cbd791015a5a98312f178d2b64db3d9d6df65cbb19f725622fc70d5da08
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 10804 bytes
font_01_sfnt_off0000e54d.bin
faa078c535e233122e2b63fbf6f1ccc54880f74cd463720ea876c3acc079e260
pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 18148 bytes
font_02_sfnt_off000114bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 16792 bytes