Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cc6f528b7dfe1e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 13:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7129b6654d81b414daf8b8d97ef4722 SHA-1: bc577419c25383effbaf9e35db7a53fcb5291d8f SHA-256: e1cc6f528b7dfe1e5ea985fafbcadb17420d824eed0d6dedda751e17137569d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to lure users to potentially malicious content or phishing sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/gudejefujupasu.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab1497633d---pugub.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/nugaganuvur.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/76648148436.pdfIn PDF document text
    • http://ore-processing.ru/d/files/derufuva.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///wopatadokeg.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/pitolifebiziwepepew.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/20374490955.pdfIn PDF document text
    • http://orderkai.com/uploads/files/89383650738.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/47281406527.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c77631d19ea---semifosegoxikoxa.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/47106051094.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wulikek.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236bc71edc---fevasuvugojejos.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/zexutedabonirikikumipidiv.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/711625921.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47899552121.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/giwirazidofudamasuxaberes.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xamiv.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/31f550fa129cba62109442c1cc952bd1/pojanukikazibiwix.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/kokedeg.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/dadetilutovigi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/h4tjf2pnrhr429vq9o4rv34j81/xutidawaxupafo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8c490a7b---42248179745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=when+my+heart+hurtsPDF 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_off0000bbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBF 10320 bytes
SHA-256: 6a7177f20342e670d4cc0b2f3f4d266f14ea6f6ed8e15b15fce08147cdd4e726
font_01_sfnt_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 16800 bytes
SHA-256: cbe3d26bdda5c2b19a13897b65f175deeb04ea6525112de73681d672db1f2df4
font_02_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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