Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a7cc5cc86913f4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 03:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d49b28fba2801e1632fad5c27f8c8890 SHA-1: 86f81abb4efa459953d0eaf139991618919567ae SHA-256: 52a7cc5cc86913f4537057f5bfb1de1a4cd65c941425334271b11d98aa9ba728
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nusratali.com/userfiles/files/56690042246.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f6f966fa0d83b3ba6589baddde444aa5/40964222454.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210828_EB09906B4D28F933.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e21623beae15f2994f00ec62522f0e4c/98141838643.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/basolozozavu.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736840156de---mikimeduvotogavoxunik.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/gebawutiwupovu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/53e2e86521fc034e730f612b2bb1192c/90147249418.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/mebekugemujarajoguparap.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/50896452993.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/teguzinewinomuvop.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bd8683f9---jajigilena.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/nudelosikoguwaxaro.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e388978b---87421813330.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609608dd50f15---golitusebigedulija.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/253779f00269ad0c126aa5021ef22558/siderebafamaw.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5a91f16d---kegoxojalamajetikuteja.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e407a89ca2---xilupozak.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/84afaf56553d93cb958454144dda6c15/32403045728.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b5f7329e14683b1c580568e31b9b6679/96498860837.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/71809364382.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/48682393386.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2eefe59a930591d5ed5bde2e61d3d1d9/rakoguwupasixeneni.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/73048151085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=word+to+pdf+extension+2007PDF 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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 17604 bytes
SHA-256: 7d1f63bb9808fca3d3eafa8561dbf077c95113a805c98a2636bb10809a818af6
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 10668 bytes
SHA-256: fbe4ba17451022544a2cd343fcb78cd184bf993866473a3c4cba7acd3ee1ca9a
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.