Malicious PDF — malware analysis report

Static analysis result for SHA-256 816d20183f004ac4…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 01:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 025d82fc61593e4ebd21f9d5a2f7f1be SHA-1: a80f357afd700607bc15668b9ccce2bd64a935c3 SHA-256: 816d20183f004ac49f6da071c2d3408787d6834b4591d7cb58bbf5294afaf7d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096133b6e670---mitat.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a422f078c2---jawesej.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/n1lkip7iqt4l24tbgs6qodu8c4/44247473676.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/38908089300.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jakoxa.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/gumumifigi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0431b8ab889bb56819c515fd409e52fb/lavoturatedopovunijinulo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080701dd70c9---wivefadadi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1vr4g9o6ca3tobok8aar4ok536/16353928046.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/87185360114.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/vusolaxesimusalazige.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ff10ea021051c06e15f0eb7ed13f950f/nefujote.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25be73262---watopatezomoranisew.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/48890783954.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090289f2a18b---55669181899.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a03333c5961---9177770402.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/jolex.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/5340515804.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c887795b228---tezejubugasi.pdfIn PDF document text
    • http://zuche0551.com/upload/file/53793030171.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ou3a09hr1r9jsq11h4b80rueb0/dapemanedofizija.pdfIn PDF document text
    • http://aimic.com/userfiles/file/28623914687.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/funajekowijopixujiximudi.pdfIn PDF document text
    • https://lemanssrl.it/file/12679637141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=maryland+emissions+waiverPDF 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_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 17704 bytes
SHA-256: c51a74642bfed88f5f1e7ad6797a9f8476179ff55b77c33e2f05ad260ed45440
font_01_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 10572 bytes
SHA-256: 09d3ffe596871e6349cb4c8cbe02aedf9a852a575c8c595544b776c731c5ddd3
font_02_sfnt_off00014772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1