Malicious PDF — malware analysis report

Static analysis result for SHA-256 520930bba21773a1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 18:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d999e5916e2aeb419176f5b42ddeea41 SHA-1: 0c76fa313a5006fd44e1c9e4e7cd3771a4004981 SHA-256: 520930bba21773a1ed7837539fbde585c53883a0a03e07a3dbd523dae3caa40f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous obfuscated URLs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8b39f7d2104ba2fa72325597f38b2adc/vusaded.pdf In PDF document text
    • http://conblocmanado.com/pics/file/56926445226.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/68793801527.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/larelulewinive.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/147086293aa0f6bc9ef28ca8953dd2db/39592467700.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/33511484268.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/42937655280.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072144352e86---75434692184.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/dazigir.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/96d8de0258d4d56ad928695b7ecc70f5/liperavojif.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/39039356358.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/839f6f882fa263671bc68e24e76c44b0/fokasos.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e36de4d6be---remokewexifurokisatig.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/991eac3d0bd6cd338a5dfbfa79f30201/18509020485.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b81705670---86873431040.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/94012981449.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d0a28cfff---keruxakedemuguseb.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/nabazanazom.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1bb7158d---bizasisekufuguwizefawal.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/09a15e2f22f18b131924cb599b91a30d/43731198403.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db9bb8e887c---23771254636.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210623021538.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/18467742667.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/22519370198.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/57958222379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=new+headway+beginner+student%27s+book+4th+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_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 11352 bytes
SHA-256: 4ba3190a939a335b1ec827455f081667d7b4d612ca7f3c654329f3bacd00da7f
font_02_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 19580 bytes
SHA-256: e24d6109c88c81c7ddc863e001558a16900da1632f4d41941a368259563913b0

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