Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa39a09ea42b12d8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 03:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05b474c01904e5b47b775c29428f9543 SHA-1: 8524f00aeaff49c0337c94365179ed8a6c1252a2 SHA-256: aa39a09ea42b12d8eaadaa62424e5eeab8e87aa2284e5677a0fd4f2d98b12bba
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rovibibodejeletusanex.pdf In PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/99424679373.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/46531126390.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/22726830550.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/52553191212.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4b075d79fae5ed2b51a9f331d698bb91/33396516834.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1lcmhvmdorcodv730mq30snsn2/betama.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22b8496ec---27420482311.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f501446e2d---benidesowixatamotegusax.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/15528281763.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/88333211910.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/duligugupalinanaxi.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/23799594771.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3909054c0---nigimel.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/banoz.pdfIn PDF document text
    • https://mvservice.it/file/13366705061.pdfIn PDF document text
    • https://777mto.com/contents//files/15519953446.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210628_061002.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/9677543960.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/sagenog.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/67959923071.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/xepajoluwuzudusoko.pdfIn PDF document text
    • https://nasikampung.info/contents//files/loxexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=psoas+and+iliacus+musclesPDF 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_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 10436 bytes
SHA-256: ae38960922c9107a560d9c884c01498f534c036e0fc62df50e857d790de72d97
font_01_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 17156 bytes
SHA-256: 8b69689c89ff9ffc206b1ff1f94cb08f5d04a41b51ede47653d8f3adf25329b0
font_02_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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