Malicious PDF — malware analysis report

Static analysis result for SHA-256 4900ccf32a66a7ab…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 08:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7bbfd48c7a1ab2457961ce480c40b7d4 SHA-1: c2191a21a11d7ddc9509bb3c838d1b20acd87671 SHA-256: 4900ccf32a66a7ab71c69dc29e4e5ec49fb7793c74112f75e6830a18a42adc95
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste commands into a shell. This is a common technique to download and execute further malicious content, likely from one of the numerous embedded URLs found in the document. The presence of multiple compromised CMS upload links and link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://chhattisgarhsanskritboard.in/sharpinstitute/images/files/12395028592.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8dce26e5111e986b713f7b4f6dc1cef1/38896367644.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/94315391204.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/pipobofabis.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7b6e41765bb50e050f782a3117e15439/78523231732.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/54421540486.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/93421814896.pdfIn PDF document text
    • http://kaies.cn/upfiles/210801154121882306k10hlt.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d211837360---motarez.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/05c581f062d7342de0f7a388289ae3cc/17425299151.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/81691643956.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172023034642.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/vozejuvugiwefo.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zeverurivawazetirobizaku.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/guwatasaxuxewirageluwedor.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/ladeluzenagonenugit.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b798839baf---jirepoboweludotarukites.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/371acc192dba9ce8992b38aa06a052b3/gezujapuvovek.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/43318742325.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b83d2ff3379---duninexuse.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/1704752712.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/pimatitipisuwivuk.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/lejerekineral.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/fuvibabebanunexalowogaf.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a219e8a61ae---89652145756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=merge+two+jpg+files+into+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 17100 bytes
SHA-256: f68ba5c58a650ea4c382d79154b048e596ad4e332226a5bf36185118250d6b98
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10720 bytes
SHA-256: b46962bd85da1852452243c648e1440a4caddd3d8eca150c7b87836e2337e40b
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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