Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fdefbb6b479b5a…

MALICIOUS

PDF

93.8 KB Created: 2021-07-06 18:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19b85db377811e047dca5cf1504598f8 SHA-1: 1cb9461a185b2cb7823483ed61437b018cc58e51 SHA-256: 46fdefbb6b479b5a9a2c1f78a444b942d12d4c3f4db9abc43ea9254f01c9efd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://akgikorea.com/file_upload/fck_upfile/file/fefaderinuvi.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768f2c1d959---40761668319.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/42e5e2f079d9e1b96dae53b002b9445b/12634355935.pdf
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/pexaginakapamudito.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/907754412.pdf
    • https://minipowerpack.net/upload/files/88870804431.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4093f970d8---9105151155.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2cd0f9612f57b167497bbbd8224d20f4/zapavifud.pdf
    • https://healthmatters.me/userfiles/file/sexuzukos.pdf
    • http://jinistudy.com/_UploadFile/Images/file/funatafokij.pdf
    • http://bet-balance.com/userfiles/file/bebunesuluviv.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd030b316---mosedamogelinabakov.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9d5k5k751ehmbih00kku5ta312/47788011.pdf
    • http://hiddenforrest.net/clients/76790/File/75987295213.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25ce431820a63d841033186ea4cc82dc/fegewiwomazufu.pdf
    • https://vadihosting.com/calisma2/files/uploads/pagonomajaxejutuweteta.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=game+of+thrones+season+1+finale+full+episode
    • 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_off00010a43.bin
0de7683ef45115b8143ab7c66bf003619e01d4319696a2891465b05557b3b645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 10952 bytes
font_01_sfnt_off0001237c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 16792 bytes
font_02_sfnt_off00013b8e.bin
ab6d3f2ccf5843fe869d9b00b436c4186d024f22d1d6c681a75af1ac6d531f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8E 17860 bytes

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