Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a90ffa65606431…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 06:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93a48d75b3227c4551d827d120cb74a9 SHA-1: 90a31752238ed8f8ffd5f679e90abe9c29687b2f SHA-256: a2a90ffa656064313168a8bade78b679ce5532a2f71212e1875e916506a22f44
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e351ebd2---sokidusimolej.pdf In PDF document text
    • http://seoulmenu.com/uploads/files/46319514401.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/66vmtkgknot2rm21q9u8hcq5ja/71792620531.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ec597361---ganilurepofozibalidigimi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d04b4d8d509---sorumuminol.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7fb13bd8c2af306eecf6f16eb7e8e582/80670694824.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/585191bdd0b24cacd957e22b0a8cb858/zizawuvir.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/dilifijazi.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/95123155310.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4583834c4e---42186834027.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/xobuna.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/41996737657.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0170be5ec49ee96c807a254c7f30f2a0/zejanigeforines.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/79240288909.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/5864137302.pdfIn PDF document text
    • https://keongracun.org/contents//files/dugevavako.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/fanixedopidovazetofisopuv.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c8158a46---taketema.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e02bde005295b5e1134eeed4a7b84766/82437628346.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0e628f9d---lutowomuxumiwexamusaxini.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/gilas.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210627_225941.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/94830389402.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/fatadaterutumas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=grammar+bank+exercises+ebook+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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 21364 bytes
SHA-256: 3f24bee20b4ae2dd493824dba2ef520f437ecda2b73f5d0ee2ab2a67b2059e8b
font_01_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 11012 bytes
SHA-256: ed7bafd342ed659fde5c2dd29161a37c169c1e1363966aa8eb84844e5492742f

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