Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddd1631f3fd7944…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 23:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37bb3ead0754ea258fa03401599d7d87 SHA-1: a5ad16997bfaf0b363e53329ab9e1390e98c710c SHA-256: cddd1631f3fd7944346fe40ce0fdb017503877266699a08cdc93092e7d3fcfec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fastbeatbattlerider.saint-fun.com/assets/upload/files/50355412378.pdf In PDF document text
    • http://xingyeknitting.com/userfiles/files/47033496194.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/putikov.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/garemuganawoli.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/zefogerekevipipumidazolu.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/jafibekerudonib.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/kedurul.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c10491eaf---nivuxumuxobojazasalawerew.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/19228223061.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161465d8de7af8---wuvufafadoje.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0b5c25bca1304ffee2a7dd5ba532e00/simagekebo.pdfIn PDF document text
    • http://geodez.com/pliki/file/46394312839.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/83250299578.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/19985732385.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210910171905.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/nowidujutipogizaluzupameb.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134098a534d6---30482112675.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/65656659417.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/xusefim.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/4515084654.pdfIn PDF document text
    • http://idroter.org/userfiles/files/70239294672.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/nidegogoma.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/361696796.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/45571753051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=clash+of+clans+loot+cart+glitchPDF 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_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 18064 bytes
SHA-256: e63213c79440468f53a2682407e9a22cf6572020c002c526db72d197cd3609ce
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 10512 bytes
SHA-256: 310104a4e12de755759e875f91536bb19513914720f3d3ccf729b86bcffb657a
font_02_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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