Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cc8efd2273e6ca…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 07:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c09b7d7c84ddd002c75ba45c3cbd6ccb SHA-1: ca1ef05a26e4ab1fc4731518fe09442e3b77eeef SHA-256: 52cc8efd2273e6caebe6a5d950f78cbbb2c1253f75f8ac077b14272853ec2b5b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 https://catamma.ru/uplcv?utm_term=blade+and+soul+2+android PDF link annotation
    • http://full814.com/upload/files/nenekigaviwugadiv.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af3f0acc2---84497351613.pdfIn PDF document text
    • https://thehouseproduction.net/file/49730528477.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/pukupa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40827973489.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/wawepovipanajalevowolepe.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/likixuruxosoxesulexa.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/xakosibitopafozotib.pdfIn PDF document text
    • http://short-story.ru/upload/file/38353485303.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091019150273.pdfIn PDF document text
    • http://glassick.com/userfiles/file/76562990134.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/fikediwedoxozizo.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kanugutatuxafejurolerun.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/71471272966.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/bililomakewukipozo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/frntv9m2ar373cujsot20411op/numiwovewudo.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090405195673499.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kajilujavisepibife.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/fubexeraliwunegizopu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4t907dcv4gupqfl86cvmnk9sl4/97996161980.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/legus.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/35da4587d6e058b047941e17aa125ea1/zobabevosuzive.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 22920 bytes
SHA-256: 9fff2222613d1611e4b5dab7d875b2fd906a930e3923f0cfc66f084e8a477291
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16336 bytes
SHA-256: 63d339403da5012aef3375d0c32c75a655ca8bcc44377089e1c0a01d59e522cc
font_02_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 10416 bytes
SHA-256: 2d66cfb79abaa05ed18a7c521f48731fa883cf2a266a5794dc2af263cf4a9f9c
font_04_sfnt_off00013781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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