Malicious PDF — malware analysis report

Static analysis result for SHA-256 b630dccfd6b3dd5e…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 05:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f106829707fb2d85f1c8cea841104b5 SHA-1: 6bbb014d7fa0ea74053cfaf3e4da248d3bb651f9 SHA-256: b630dccfd6b3dd5e76c783da2e84f088ef143a82e683dc003f4c83e11fcfe05d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those hosted on compromised CMS upload directories, suggest a link farm designed to redirect users to potentially harmful content. The document body was unreadable, but the heuristic findings strongly point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e308e0296---nitanekuwuruninune.pdf
    • http://ibb-online.ru/f/file/vubasukasuwejatafuva.pdf
    • http://dtcguild.org/clients/80367/File/niwelomibalatavuxetaxezip.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4736d9174c---vapifawaxaf.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b2f3d7dbe3e2ca0bc06c0d10f6e814a/30059941804.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160718b652578b---98560116597.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec56c9df01---95452855496.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/hkv1gesjvj1fa04lbndls1arg6/geruwurudukavawove.pdf
    • https://ottenburger.com/userfiles/file/molitetobitigutowokewoviv.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be079c6db---92819178010.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acf6320dfad---15546235985.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3104f77253---mowedesigadejebox.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d16b4a2e0---jipuzugibu.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9o2gigmu6h7fedn78dkltugcl3/torubojo.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092e6138878a---wuzovigixisenatimapu.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1c56e83f4a9b7a87cb70c556ecae62cf/girizojuburimizezabogo.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2eeeaa028---90802504629.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088454483efe---puwirusefibosuxid.pdf
    • http://keacg.com/upload/files/60615380541.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d0359028c1edad58fb18a1e5cf5b1805/dasuzipogitodavutijopozol.pdf
    • http://noithattamphuong.com/upload/files/waxuxam.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092910aa170a---katirilutovedikitureb.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d87f5669f---wugavewonaxabasapokisuge.pdf
    • http://dlt-nkp.com/fileupload//file/tanimeliru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+importance+of+being+earnest+funny+quotes
    • 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_off0000f1b1.bin
b6b934bfc8c695b0cfd623db63bb707ac546a99bb14581e3dc450e1662f039ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 17484 bytes
font_01_sfnt_off00011e34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 16792 bytes
font_02_sfnt_off0001364b.bin
43de8a719281d57687878585900c21b4edad29a97b038fce8357a507a37b7e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 11344 bytes

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