Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa91db184f71ab9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 11:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7df9990ea3081b9327d63e4128331d23 SHA-1: 23271672b5e5ef8285e0064dd6f0e307e54f41f3 SHA-256: 7aa91db184f71ab96e77fb4ce02c8a6e7ed314449558c99dafe6dd035e6e3146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised CMS uploads. The presence of embedded JavaScript, flagged by heuristics, suggests an attempt to execute malicious code or redirect the user. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=hill+climbing+racing+hack+apk PDF link annotation
    • http://rockpapersun.com/upload_mce_image/file/pewolitemo.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50454699720.pdfIn PDF document text
    • http://khocabien.com/uploads/files/6555249124.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/75555803755.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/65507881156.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/dejimagig.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/gopib.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425e045f397---pajanupinesube.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613865b8c0655---xijafizogukavas.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58794623398.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/66752419846.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/sikejajunewanasafubo.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/64875023990.pdfIn PDF document text
    • https://simorgh.it/uploads/file/fonapukeredisuzexav.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/lowanupaw.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ab49c8ed---62602013281.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/89542208811.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cc81224c---porubagafaregiguwoga.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/85345080773.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/91437541579.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jidotelavosojetasem.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210912_182852.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/tabuzewenano.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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10524 bytes
SHA-256: c21fb058e3b0e529d33dee0dbdd6fe7bc94a46088b3097edc14091055a35dba6
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 18428 bytes
SHA-256: 5c3be1247cbe99bfe7dc4388ca47454d98b674a5703bd06c0f9a3865896c0641

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