Malicious PDF — malware analysis report

Static analysis result for SHA-256 825b81e643f514b4…

MALICIOUS

PDF

85.6 KB Created: 2021-08-24 19:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 60d998dea6c91ab7c73793c3d0859a46 SHA-1: 30a8b49b743d0704d4d8b4f272972ffeab0e0662 SHA-256: 825b81e643f514b4f66969f8114aceda7501543f502599a6f72807f5650cdc4f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The primary attack pattern involves luring users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuepancong.com/contents//files/joraketawukakixevilutev.pdf In PDF document text
    • https://airshow-bg.com/file/13616287713.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/59465bfad6bb72b59ae6a3d4861aa301/raropedo.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/16804604202.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610999f33f2a7---49427184355.pdfIn PDF document text
    • https://shunnasato.com/sebeduzojino.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d619d104---xarukojiturogemerivo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1748255a---seruboxifu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ae41dac214f298ab7ea1c1f07322420/kuvolelewigafarojefo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dc66dc1cfed7c6ebe9dafb685835a717/nejadapimutuwonus.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a57e495df---17551774329.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/62293869758.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/loxatobodarufabititez.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/101946d99183698d525c2fa067d5a6e7/65130358936.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/5994922667.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5c5fe04b13f753bd58fda072f33391e9/karipegotonisumorixeda.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/41ce2fed677b370194a12a80c78f3eda/gozifigunewogudijelezod.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/40309118714.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ee45c511c13e8b04f8630af2a4b0580d/porujojene.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0c0042cd46346b3c126a664b48037f59/65360143808.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cbktdn0dalvfeapnuhgqfpoq61/pudesiwezupul.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/wepegakutevazimomawadum.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/51381304245.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4615fbbbc47796850cb3cb49ab7ba6b7/migeloxiwukirogig.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfe501320---pojomodowaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=chair+conformation+r+and+sPDF 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_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 17548 bytes
SHA-256: 293dfd0b532a044816fb079fbb53e423d1e3dd6c44ee187f89b8efe63ad9ddd1
font_01_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 10592 bytes
SHA-256: 54adcc38589c94cb0b6be46e2c3924a4ff5421673f0ae9d27acf3abfea864158
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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