Malicious PDF — malware analysis report

Static analysis result for SHA-256 9053cc560085bc00…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 23:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4055a320f04c819467b9d0bd65dc0d8 SHA-1: e1c6fbb436ffe09baf980ac3a282696d3422614d SHA-256: 9053cc560085bc00e9857450a8185e5b441166e1a5238ce0759fda0cc48b78bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://legalinet.eu/userfiles/files/85944504045.pdf
    • https://nepalimodelagency.com/userfiles/file/tabagevulujozafonoxuvusor.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gi34reth65s8tc0mdd0jn5juk1/65427639520.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/duprlnsa3eh7aptle0ipkpgp1r/53602501340.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb770f2ef---gobawikalijolet.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11f69477f---ropefukelub.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acdcee46dca---75940119266.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e33b3d5c---19063276783.pdf
    • http://dzbnf.com/upload/file///3329184979.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f6a3f95e---30525387806.pdf
    • http://barcelonasixtytwo.com/userfiles/file/26997316839.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb12fe164d40b779a1e624c6600a227b/fefilukofejubuk.pdf
    • https://harom.ro/files/file/xowofetataviwo.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rcmu3ngub3o9l6vejkg603oi03/61013395705.pdf
    • https://webmenuplus.com/images/file/94274436918.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609067dd83043---88650864323.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6eee3f5cb---41060201868.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fada64ad7---49148263984.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hh4sm1vrdmcopt8pp7c9jjjiu2/90424566086.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xokivelafutinufapal.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723237789b1---muwemaxezekejefetabewuv.pdf
    • https://aurorabersinar2.com/contents//files/refakolotanarivalowolip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=environmentally+sustainable+society+definition
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e4f0ab6b539ed66786ceff3da4eb8c25/tejefisada.pdf
    • 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_off0000e8a1.bin
efa4d7c126e8b5d2af2494edd41fef025738a78e156e1d31bcba65dc07c40618
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 16380 bytes
font_01_sfnt_off0001130f.bin
2511c3a7e197202671246e42b5d2b2526e4a30983d51b7c4ab58b02cf6be58c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 11040 bytes
font_02_sfnt_off00012ccb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16792 bytes