Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b238168b977aaf2…

MALICIOUS

PDF

148.4 KB Created: 2021-07-29 15:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 0f32e7a5ff0b45a0953d6199b103d7c8 SHA-1: 22188f3b6fb63c2a2c5ebcc2e515c9e9489d63c0 SHA-256: 3b238168b977aaf231a65b9679998f942e168c465a1c20d53365595f7ea0f45b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://archism.ru/uplcv?utm_term=rocket+league+unblocked+games+gg PDF link annotation
    • http://airholic.com/UpFiles/WebEditorFiles/file/basexefofopu.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/wodukeboxulibugafa.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/runegutidobapigetotara.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/7382512061.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/34985233456.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tiweduxedijurufoka.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97f530999---dazoborajulamavapapupo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef907aa5c---jukinovok.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/70722370482.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/77206116335.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba87775a7f0---miredunixofujupiwiwenuseb.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a9981a81c4f6f60ee778702d8c52ac33/pekixaparoginotojuxe.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopewifakedumunaluzuma.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081931bc8ea0---faxofudalemoposu.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/pinaxuxavegitarubiwavodu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6bd3bad08a0db3099a4ed41f5efbc60d/58695947333.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lovowuvumakizakanapanam.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/9025724173.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dedonumod.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa33506f3---20859217699.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7715f19c4efc9012c2493ddf97fd3691/68623626541.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bkv9h9e0mjhtr8ku8f107qr2e6/nirozetoginiputijix.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/11221658081.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/9320735074.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/91420c3da6237e17d1c211ed4ba46c43/warufuvufepaguxojipe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC88 10896 bytes
SHA-256: 8d61c38f8d5a8f212a2b32152c896c6081e5645981a557d3fc1fa7981bbb1c6a
font_02_sfnt_off0001f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F595 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00020ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AD6 21828 bytes
SHA-256: e5e55df8916b46ef428ae4323552959307180d236a46678e994907faf533de1c