Malicious PDF — malware analysis report

Static analysis result for SHA-256 512406e24d039594…

MALICIOUS

PDF

86.7 KB Created: 2021-08-06 01:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4559d4743d077dfa354743d31e13a25e SHA-1: 29b742e4a29338b84cd0689e8d91dd81ef2c5825 SHA-256: 512406e24d039594bbc9973dd4246a5ec62fb95e25bfd80662ce8a3056161eb5
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several URLs point to compromised WordPress installations or disposable hosting, indicating a pattern of phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://catamma.ru/uplcv?utm_term=past+perfect+continuous+tense+active+and+passive PDF link annotation
    • http://khamtribacninh.com/images/files/gisozi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160813309ebce2---32258598977.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160711ad960722---56135597894.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ceeeb992b0e147fdb5badbf119f25e3d/61180139306.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/xadukasifezowekesiwutorog.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ea9719e774fd891583a0c4ac4b022d67/54330305202.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/b1tdab266cp8qlc4r97jbfoeg5/miwepexumefowujifakiza.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ac9ebbdb050cf7688b6148d29e40af72/49461266278.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/sarilujowasupizera.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b298d1f700---80554956842.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/c4df06qcuirldl50al6ke4s7f7/32799681103.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb141276bf---56007932770.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/pulutodotufowelasuxiju.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/fowupuxujogafepojojoj.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4d56e747d4edf61e36a9638707c8633b/117682321.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b0716ec3---18017294769.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/94492155041.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ebd4i1c0lf5t5ha9gbecbf87dh/62056122320.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/88764647347.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/39486159266.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 17020 bytes
SHA-256: d59ceb7992bbc338b72168d431775fc43612175de51b42c4a2d8b7da88eac0d4
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 10732 bytes
SHA-256: dd97a524d51a46cec431e45acba6dd4187994a537ee015ac0134e2b29c826c6d

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