Malicious PDF — malware analysis report

Static analysis result for SHA-256 48321712226e34b1…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 01:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d94d786f985919256e183d229247e46 SHA-1: 37321b4d4967a54f04580e0c1935f34fa56328d2 SHA-256: 48321712226e34b1af7de1571cac7cba7f746fb69bbf099881beaa73db5cf126
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://provia-events.de/pics/fotos/1/file/lenigazifosasomilew.pdf In PDF document text
    • http://eros-arena.de/eros/userfiles/file/karal.pdfIn PDF document text
    • https://linardi.ru/files/file/95393945715.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wumojenowobimenagusajodo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/27368602392.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/fizezelerepumimaxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3bb9bed9---vededa.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/bh7158g0qf5b1adrm6db5cen21/xefolarulu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb0ba0ec9---88251578170.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4q3gpd9lblmokrlsduklortr6g/59781637269.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/78301744354.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/60057549065.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d476f59d9f---41229850066.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad055ed14c---98790274162.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4608edd46---degopuzosumofobek.pdfIn PDF document text
    • http://zubrcup.by/files/files/97746842868.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///17539756049.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/r8btjptmlubva8nljpu34oi9ao/72196159048.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/48203115022.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b3e58d11---ranafapinuzepoko.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/90423216548.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f36524ee5---66150631012.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81f781744---pazipun.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd8b76e03---ruxevov.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/mokiwatisunubegawigi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xolavabe.pdfIn PDF document text
    • http://www.polni.si/Images/files/rugafajoxogagabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+history+of+buddhist+philosophy+kalupahana+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_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 10888 bytes
SHA-256: fc54b0380d9b2fe6e024f9ecbfd2572b3157b9d18263c2a2178814e195c75157
font_01_sfnt_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 17340 bytes
SHA-256: 412f1c294e846895162e12bb4f13b4560984c2581e78985b0226d604b8bb1b8f