Malicious PDF — malware analysis report

Static analysis result for SHA-256 7272f100b8188d79…

MALICIOUS

PDF

96.0 KB Created: 2021-06-28 23:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeafb5ecf15c0b6ec585f1830a4f5c89 SHA-1: 1e738c233ead4491615c1d575453d021fef58d20 SHA-256: 7272f100b8188d798299490426e211c1e35e8915a53aeef191ab5d57c327b206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://detectiveoffice.net/userfiles/file/papatovorajebut.pdf
    • http://snotlicker.com/clients/10243/File/fepavivifinuj.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094793eb017b---45128661904.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/vedasuv.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9e2e04c5253f3acf5f7bcc2f76bdba2b/51853347070.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/akgoptst9g6qinnlb4lv5pi6j6/14238862185.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a424653ab94---jerowebutepid.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0e37f00d1---vimarirepilibirugovowudas.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba106cfcc---fexafotapoxutavofejalesef.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/63b8f44e455eebf505465c8bb252cba4/19009803170.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1902b45580741288dad5216d9f0a5206/17570359835.pdf
    • http://straub-online.ch/userfiles/files/sesijulufevomag.pdf
    • https://lesura.net/userfiles/file/wusotimegosotitukukami.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/j6qr3nqr6pvtev4u8ljj10uu00/lololagigan.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7fdcd78d---5692054381.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62d3fe8c39---23522812886.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f504da63ad---84314955092.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf2acf56c---15257248737.pdf
    • http://aftckwt.com/uploads/file/voxokiwufasu.pdf
    • https://icbacademy.com/upload/files/840627314.pdf
    • http://mu-rrrc.com/userfiles/file/kasugukotorezuzejo.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0d87665f1---penilegajiv.pdf
    • http://seanmore.com/userData/board/file/38842991477.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160861606a37e7---xomomuto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+natural+history+museum
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011584.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 16792 bytes
font_01_sfnt_off00012d96.bin
6ea7b136ffd94ad95e9641f38473e60d6f6c860b5999a55626701f1ecec85195
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 17160 bytes
font_02_sfnt_off00015a46.bin
d772d4b20c08b895c40e3a12112b1cbeed2db738a966c304f26955a7b0b296db
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A46 10720 bytes