Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdd7b3dcb91aa5a…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 16:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80d49da8bcd12e3c8f13c0cabf57645b SHA-1: 07731e39a94b88660622ff2966b998a90148787c SHA-256: 3fdd7b3dcb91aa5a09ff39beb4725e02d0f8eb098758e4a22ca33714a3a8b8fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=one+true+thing+by+anna+quindlen PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/542m0mqoniiir8dap099o7khtj/89994905894.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3e01c3bc---nexemowibus.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216251247178742.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2248354954b5a6ceb78d04aa7e81e292/58553345673.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/76492702152.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/88613090205.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/25770038677.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/92064357210.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/92623128675.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/65759847975.pdfIn PDF document text
    • https://digireg.dk/upload/13304506911.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f89ba748---23753476788.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tojudepofixej.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c29dd8f69---12317379923.pdfIn PDF document text
    • http://primaneighbors.com/userimages/49870880846.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eefa4ec911c3c311e503a5a8ef176383/79221381038.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/13338460085.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160953ed7b995a---jepefewowol.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/befixonopetometogelek.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081eac053d69---sejuniki.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607203a10949b---38160909835.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c28867473d29dfd003eb73b9863657cd/jijalijiwibigosunujixulot.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jalufefidanisafodumipesa.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/vemavodagaxagep.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u518o50jc5oa6imdjr453uut31/43053084440.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_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 19288 bytes
SHA-256: 974376b4997c5cad0f87c887b32f6dd02d4940b17ca013d959a66e29fe2fee6e
font_01_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 10764 bytes
SHA-256: e8aad34cd915bf9a87a47eb7e9a80920d5efd3c4d2a82490abc1dc9182741960
font_02_sfnt_off0001467c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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