Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d42c4a15cb7cb7d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-28 04:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f36fb51d252fbd968a2c1eb506b0e654 SHA-1: 513c0b43a2ccdff3a752185e150d528295f0c2dd SHA-256: 7d42c4a15cb7cb7d9be105d450b9f96e9212c37cb3d5330845cccff66ca1f5cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=auto+refresh+page+android PDF link annotation
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906220357647353.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/27925515707.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/25491995969.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/12601536581.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/pakufewefamakokiruwazidod.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wizofopabefazegijones.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/67729192016.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/95t3sedaus867nk03v4d54u8r3/89166924687.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/janopegixafuzapawo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16149efdfd9c72---91955464729.pdfIn PDF document text
    • http://consade.com/userfiles/file/vokovakinusezed.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/91099811878.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/fexitififogolafif.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/703613094c13c15a9ce6434d253ed0b2/85828612157.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8a3f767b4f2ec9ae871eba2ef7d40b49/25860808224.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/wusulelijamidiweloted.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/moradaxufuzovirujomumomo.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/bekilabumavod.pdfIn PDF document text
    • http://mamitobe.ru/files/file/55902474002.pdfIn PDF document text
    • http://licausi.it/userfiles/files/12576549185.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/14018039117.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/80175119035.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/jigovanagufimogajugada.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dcf52998e937a135578624da8dc69638/lokozoloxanapubakesi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d04f52c2da290035e60927cffd04d789/9597870130.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_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 18980 bytes
SHA-256: d77604c922fec544600bb8a13d56f3d1a58b463554521b2b6115426468492f68
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 10812 bytes
SHA-256: cb01e75ac1a720448329eaa927639dbefecaa85da20ac675f64ccd2dbb1b7711

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