Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a0af13986bb340…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 20:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6645fe716adaf5124aeab444e7b52b5e SHA-1: cd0071330075bf31c7cbdd516fd1fa49776f23c4 SHA-256: 16a0af13986bb340716f1581f66e88d708e1b819afc29ee5c38946add1e4fece
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several heuristics point to external URIs and link farms hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF files hosted on various domains, including compromised ones, indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://perfecthospital.net/ckfinder/userfiles/files/51133997472.pdf In PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/kasigajuzil.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/jusojaraxefebalimuvi.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/8398813472.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc029eaa011---57909685607.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad604def70---55593995048.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0d196d88e5082a524cc8f74c1e445896/lanasujivefafesimu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfa28369f---78754202816.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f88698952---kapotibegegiwi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/47226032252.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/62187370858.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/nasazegilix.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acc93d3dba7---36661788207.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd397ea102---93077150464.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/41866659603.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/xubalamizatavekapiboju.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/54604782086.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/vosowibatetifetadakijebaw.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/35983301459.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2c531f521---fugeluvofejuwanoxavalel.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10862b1b3---metutatareneb.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/54388473818.pdfIn PDF document text
    • https://majubesar.org/contents//files/67692430050.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/pazebaxogukumo.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/37460075769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cuisinart+pressure+cooker+manual+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_off0000bc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC52 11004 bytes
SHA-256: be0b897f89669235bd46f247e5748e70855590957d8490a51d53292859b3b027
font_01_sfnt_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 18072 bytes
SHA-256: db8891c69db917794fb786eb014cadd90ce7e8a60b6bba48eabd72c14c916eac

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