Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b6f496ba58e5c2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 03:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8eecf2fb1977bab6c438ce95d30f807b SHA-1: 773e20add0194f7859b37652e1159e7e82b4246a SHA-256: 86b6f496ba58e5c236940bf905106051a50924896a6f10f4ad28b03e9fd96720
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristics indicate that the PDF acts as a link farm, directing users to various external URLs, some of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=download+car+racing+game+for+android+phone PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v0v93k8ratobbk1fsh8dbogbil/bopuxikuzinadubif.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/runofugewewaliv.pdfIn PDF document text
    • http://edeins.com/userfiles/file/lonibofazili.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/mevaj.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/86113261389.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vodidebamufajik.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/kemisuboluzoloda.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/tusexalaburavu.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/38273444231.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139396f60e3a---buvenoxenidupulix.pdfIn PDF document text
    • http://kbchina.de/upload/31188847775.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/51334675061.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/5643936466.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/detokazufavijiv.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/petuzuba.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/84477044099.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/24162500092.pdfPDF link annotation
    • http://richmore.kr/uploadfile/fckeditor/file/suxofibu.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/68914578319.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/zurapusuzarokabekuxomevu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/malujitumo.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/85774304656.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/femopuxelas.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae484b151---63682761844.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/guguxene.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_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10888 bytes
SHA-256: d9e12d0f478537978ee4c619b47600f459c8f04e69f4b1cb3c2a0813df155c98
font_02_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 17256 bytes
SHA-256: a16b6784b03d9129676cf0cfb7ae7b2154e4e96dddca520407b662eff21674d3

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