Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbab79497fb1842e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 04:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb8f0efa28ea8f394f6a3abcf3f10c5d SHA-1: 8348b1beff23d882fe90a7cfd65849639109bc95 SHA-256: bbab79497fb1842edf1e2ec1213562c5fcaa805756c44a6fb11450e3b987e1b9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content or phishing lures. The embedded URLs, while some are marked benign, are part of a larger pattern of potentially malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50f158f47---wojakasidi.pdf In PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62456401f---54138073111.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/19682801791.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/53772080664.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/79j19t6ips6p9ov6u366ptnnts/jonavazuwafetama.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19d412398---gazipolutulagexur.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1344269f2a05df71af3c41dfd45436e6/75238292301.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7aef95cd9f50bb92e6defa7e22c914e9/57679081455.pdfIn PDF document text
    • https://guijek.com/userfiles/file/gebasapodiluwiwas.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c582c9f28a---75575212775.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/14565487178.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a4bfef43f651cc982784b61c03a6ba23/15825783660.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/94931296948.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/hurc4pu2oql2airqtqdjve0ito/26267391457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13fd69fc69---97669335741.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e9749122b---78520273476.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac220ef5e---nowotupimilemozekebukogub.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba910fb3b14---kapesibuvi.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/kexijalefegojagiwopowezo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/8267806593.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/foterafikitonomewexuduj.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9208c0a888a3c45076fdc66b636d1df9/gimifarelirufaderoxufela.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/gamobewelafilebakuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ocr+pdf+google+docsPDF 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_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 10364 bytes
SHA-256: f509f966c35c48dd5e61df26d451ce212c72df99dd143d422baddcf32b933c47
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 17612 bytes
SHA-256: 912b196f9f2035e2cbfefdb68555cbdd766b43b01705fe4dac136f511eb2953d
font_02_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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