Malicious PDF — malware analysis report

Static analysis result for SHA-256 915870eb5d3e2553…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 15:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c1c06986c88168ecad120f5e7b14598 SHA-1: e2c5430aa3e3f6ae223f1b71938e7433fe417d90 SHA-256: 915870eb5d3e2553f70a54b6c0fdacf657bd83b42ec16a9b07c6f164f66416d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/a8294f013f41d7ae8bd33d19e66c10a8/raxoxelewuwu.pdf In PDF document text
    • https://birudongker.com/contents//files/60107285931.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d185851b---lubigipogezegula.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612777611ecef---jotubowerazop.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/xixusilizepamil.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160751e5d7b53d---rabixemin.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/bajigosaromeloz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739b01a875---35940019889.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e3920318---27860676505.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/48248373674.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d8010dc6---pavijexewola.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/fokinuf.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160934e27d55bb---51465180654.pdfIn PDF document text
    • http://klinok-saintp.ru/files/pusiwitipazofutuk.pdfIn PDF document text
    • http://usagimatur.com/files/others/42793483708.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87d58bd962---kunakawuzed.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/36525578960.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866276757cf---powiwoxelulutuvagiripujo.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/43471446670.pdfIn PDF document text
    • http://feg.vn/uploads/files/birimalipepabodo.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/kevizaraxe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9585692ce3---64283962557.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/dcc2f9c8a9bfb64d7ab24213a440126b/84708933428.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c60e9c6a6---popowemedar.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912195985c---26695141642.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/razejipenikasujurela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=roommate+house+rules+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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 16532 bytes
SHA-256: 1a630088043c2da1286a331c1efb71316fda4c65145e9b012325feccac3cc0e5
font_02_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 10712 bytes
SHA-256: d5982880062abf2215c298bb5ba03635830c20bd7cc4f000a927e5b9b8a9dc75

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