Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b630c5dddaab9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 10:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b44aca0a8b847ab82339d29a13225ff8 SHA-1: 2b32839440bf8d71ff97d67a7a8a7dc3e8fb769f SHA-256: 115b630c5dddaab9ec97c911e64feb403ea74674964c72089cf7a13f08f71807
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The file's structure and URL patterns are consistent with a phishing campaign leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/51a7301635ae7cdcefadc5901627e451/74876067216.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a53ea3ddca30ec2b2c5d6b405b98bdf9/58697564517.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/58466067575.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0f5428c02---46499312015.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3eb30301---wuvilowepipatategadisa.pdfIn PDF document text
    • https://preciseenergygroup.com/media/62695925033.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c79912228c9d82441f94b330d99d8c9b/luxadosazuwelurufavut.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/18608984856.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t843u8nlv5o5vl5s62c1vvg16e/vibivufulijurezume.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/solaxozuwiridarojovixitid.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/muxum.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c35ab140---76959118931.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/sufiro.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xosefifaxurarug.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/mupopuvofirumeguxe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1516c6475a6b9d7ccfc2da2dbf836406/11295529157.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d9hblnknl3lcmb6nr4c2rbse80/salaxogetexed.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/wonexofoxerinokojubiged.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/18451968053.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/31nnnv0hgmbrdkr0gu136aaqfq/kiruzimaxilijefobopixix.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gvpdpdbvi26vod3svrcap80nvl/nibedu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613180bf81b90---77487006257.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9eabd0d5---dudeworapazike.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/73272973914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=oraciones+catolicas+para+ni%C3%B1os+catequesis+pdfPDF 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_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 11088 bytes
SHA-256: 11dfb89ac9acce443a93f255138b9979360760b14f22f937d0d1c33423d09837
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 18332 bytes
SHA-256: c42a170b28c88902c2dad837ec1d962ff753f15ea5134fbc4e68c9e4196225a1
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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