Malicious PDF — malware analysis report

Static analysis result for SHA-256 3549813a73438e11…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 21:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f362a6297a7a24b63cffcf63a4799010 SHA-1: f9fa8ba48f2f88661bd27c820ee42fd4ad0040eb SHA-256: 3549813a73438e11aee91bbc889850fa437d88d6f57d78dac50c290ccff01108
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=how+to+switch+from+sd+card+to+internal+storage
    • http://isspskola.lv/userfiles/files/14265470369.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0508034232aed40817dd410b1ebdfd7d/7177241569.pdf
    • http://cloverdiamond.com/file/tifokunekawezuloxu.pdf
    • http://sl-light.ru/design/img/upload/file/wugepomikivebebu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16999b363---23569662499.pdf
    • https://akamercedes.com/images/uploads/files/40699418965.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/70191255066.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/26223536793.pdf
    • http://nesthomes.in/userfiles/file/27694925836.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/99310079230.pdf
    • http://jan-fotografie.nl/upload/files/tuwamibadobinibotaragi.pdf
    • http://giasuminhtam.com/Images_upload/files/vojalakuxokavebuvo.pdf
    • http://mobitransjogja.com/files/basemivawibafose.pdf
    • http://imdmotors.com/uploadfile/file/2021091701293116.pdf
    • http://creationart.hu/files/file/56197246934.pdf
    • http://grimastone.ru/files/kiril.pdf
    • https://haruhonpo.com/upload/haruhonpo/files/fijinifutejubake.pdf
    • http://mynigaoe.com/upload/file/20210902095226.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b01a8d2b292732c1f3c7bce1d724168/43132177658.pdf
    • http://studioaba.net/userfiles/files/jebebeteko.pdf
    • https://rosenstein.lu/userfiles/files/ratixabunorired.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/notiritilatevanuvi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 16792 bytes
font_01_sfnt_off0000ed0e.bin
0341df3bbcb57e5c77f2112ce9f5333bc2675a56ac150da9394b182ab424bc19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 17764 bytes
font_02_sfnt_off00011b13.bin
e02786cf9d50144ad47f63edfd53ed887e86af4c317d0d2cc4032977a6a45288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 11000 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.