Malicious PDF — malware analysis report

Static analysis result for SHA-256 802bd36b7d021331…

MALICIOUS

PDF

110.3 KB Created: 2021-07-28 05:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85c775d5ecb2f3afbcb17b51e9813fe9 SHA-1: 628e1e3c5a1a6a90f96a59c9c722dedc66cf36ae SHA-256: 802bd36b7d0213310e461effcb9e305dee10df108e9fcfa31f7ed8cc927f26f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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 http://alfonsoguiggiarchitetto.it/userfiles/files/dozeroligujizet.pdf In PDF document text
    • http://italianopizzeria-pg.com/uploads/files/fukabikanowefepu.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/sitemelugosaw.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/89936089745.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/59dedf62059d2e3f6145d59f3dccb79f/79474595241.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/matigotogemi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4977bf47b---44413229227.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/xofaxazotusuj.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863cacb9a7---57409145557.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/nexumubijotoxopatuf.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210602155359_353378884.pdfIn PDF document text
    • https://cecprint.com/images/file/minikidozunowimevomusadew.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xinurigepozamukow.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/v76remr0nttotdl5gogbgv6l00/disazodimoribifumaselomuv.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6e229ab45ada96b56c0a0c26b6c16cb3/gegoxaj.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rarigimimego.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b930abdd9aa34a05e31407af016b0702/79949173062.pdfIn PDF document text
    • http://vtaky.sk/media/file/89070256996.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bagowimikubovibusexavasi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098599faeaf2---wepogiluma.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/venalolajakutajowa.pdfIn PDF document text
    • http://rayer.cn/d/files/19632581780.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/39205778168.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5a77bb93---63170057289.pdfIn PDF document text
    • http://northcity.rs/slike/files/19000256634.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f95a89e0---49265670037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fetal+pig+dissection+lab+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 17128 bytes
SHA-256: dbe2783b21b938c42498ef8105666bb309e3cb4bf8fa6066c23c2b50593dcad7
font_01_sfnt_off00016312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16312 11088 bytes
SHA-256: a67d6b7f0cc583d12de98c5282792ef0092241d3b47e17e741791522fd996b8e
font_02_sfnt_off00017c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001948c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1948C 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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