Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f042cc6a07120e7…

MALICIOUS

PDF

85.1 KB Created: 2021-08-03 12:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44f84dadc1cd4d9de80b08f4b80bdf2a SHA-1: bc38935020c39e56e3703d0d8bb56c9b7ed00e3a SHA-256: 1f042cc6a07120e76d2ca1382d184a75c6a8efc2dfc428920c460a44d35168f4
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that function as a link farm, directing users to various websites. Several of these URLs point to compromised WordPress upload directories, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=is+clownfish+voice+changer+free PDF link annotation
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c9478a9d102e1a682b8363643d974b3/89476138345.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/maxixinamefusirur.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/44409318839.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/43346726266.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/36155551309.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075bac69a737---gagowututimexakapaz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ae5b6e59---45147355649.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/139399860.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/wanekosezusadugujarafat.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/24388484919.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/31320166797.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/zowazevimemilunaro.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/gatumofarof.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/78777335026.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/bedulogad.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/fovix.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9d33d57677b87671c324bd98f2f22f57/wuwebogumozin.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e000dc985c---resijikaxabumat.pdfIn PDF document text
    • http://cichanski.com/Upload/file/muzobadisovuwumurubupu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/finewukizaju.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/buvabutatemekubideno.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4657e2b805159a54d83e358753e7c7c5/54634267864.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/32710502827.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/sarixigo.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_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16372 bytes
SHA-256: 0a3993d99f4f38a09c5c75d541643ffc3adc8696152de0d466a3e28f8baf333e
font_01_sfnt_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 10620 bytes
SHA-256: 0348ea8408e10693ee1fe6433082872ca22f338525cf3e17a8428ef96b4af03c
font_02_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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