Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a40e91fa7be93e2…

MALICIOUS

PDF

141.4 KB Created: 2021-06-30 19:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66285bfb939c3b49d99b1cb5ee432a2d SHA-1: 5bf0e1ada962035f15ee7dfc1b67473521d86944 SHA-256: 9a40e91fa7be93e2160ffbc36ca21566847118f7d986260719ec8047bb713f04
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9079

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://orgue-chantepie.info/FCKeditor/upload/file/lejasil.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2643211fae873a08a195322efd95f8b6/20997869831.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/50cd4fa81baed247ad1becdc896a3f60/34630781698.pdf
    • http://mwflower.com/upimagesfile///nepug.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/26b1501af71b287509dd3ae71823e3a4/girerofux.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498a6a2a34---lutefelunepaniboku.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/17d91ff4df9faefe77399056b0202a1c/18341615472.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c3c947a5841207465ac4f696ff841918/40777282757.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160793cceeb0c0---61895673096.pdf
    • http://boilerservis.ru/uploads/files/82943239604.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c875c0632---88245590864.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776259d356---salezomedo.pdf
    • https://vansuloi.com/uploads/userfiles/file/83263858037.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cc282dea89221d16e311cbfe708e510a/66651671738.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070feb37f0ab---fimoputuvutinupefitajawo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb49d0adcb---rowixitugimum.pdf
    • http://mamnonlittlesun.com/upload/files/fususuvajenajigus.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609793e284482---zopojifagovugor.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1bbda37f231381d0af37b44839ddc3e2/dojepukedemuxexutozipexub.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160978332a24e1---2868456463.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962f5e09332---wodilulununokoxuzigug.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ec9989028---sosuwizojupupo.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d15692a20---99413761130.pdf
    • http://box8websites.com/ckfinder/userfiles/files/kofupu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45688c6bf---95808754899.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=aesthetic+line+copy+and+paste
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110c7.bin
51bbe11b675f2d5a7f6b04f8cc1d64e25f3616cfe1e01192fd26c61e5f42a876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 8952 bytes
font_01_sfnt_off0001231a.bin
8321cee6557de018f72f840a5c4040332d6c68b9ef4202338cecce81d3d4329b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 4016 bytes
font_02_sfnt_off0001320f.bin
3f4c84900bbb20763ca321c34e1ca6e7848e2acab531913165daf68242a301f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 10608 bytes
font_03_sfnt_off00014a46.bin
059830d280b7743560b2a79f78be20a70064f4edacefe20889db2aea3bf2cebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A46 38688 bytes
font_04_sfnt_off0001a036.bin
bee191231788b35ce69c6641a450fa5398bc0459bd9fb49a6dd91a63fa53bbaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A036 45060 bytes
font_05_sfnt_off00020ecf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20ECF 16792 bytes

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