Malicious PDF — malware analysis report

Static analysis result for SHA-256 902b7a18f9be95ba…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 19:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c52839debb19a0bd37eb7bb6c6144eae SHA-1: 5ad33623273a0ccc1d3b327df989e47aa8ecc7c3 SHA-256: 902b7a18f9be95ba2a47bf4650a0659dda6f0ffba4fc7e03c3980a63ca2c89c6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on potentially compromised or disposable hosting strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=how+to+move+files+from+pc+to+android PDF link annotation
    • http://iranjobex.com/cache/fck_files/file/nonapelejopi.pdfIn PDF document text
    • http://ternovykh.ru/content/file/womezaf.pdfIn PDF document text
    • http://newworldss.com/uploads/file/99394677839.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/zuvozinijipakusosu.pdfIn PDF document text
    • https://unitjaya.com/contents/files/xakolapokax.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/84228134975.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/085db157cd7c9e99a330242e15b47513/84873333659.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533992e9e53.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/fajefebusasusezu.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/goxopewuxexexitokofibimef.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/lurig.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee9dc0b68---dogilenaxapixapevelikij.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/ximidataxapipodizudod.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/55814542384.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wurabonad.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/vadaxowemefevawuj.pdfIn PDF document text
    • http://getvisa.ru/images/File/98057154122.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/96047287160.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/1098481772.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/darupanudobuwoje.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/88563308082.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/14570594718.pdfIn PDF document text
    • 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_off0000aec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 10924 bytes
SHA-256: 0e7167b9c21d7e63d70f8d90007baef3dd2210ebf50a5674ff531d21f368a28f
font_02_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 16108 bytes
SHA-256: 6d25a8621b94a7208cb482c31d33a1d8310d53d144e65116664c26e6e843a1c9