Malicious PDF — malware analysis report

Static analysis result for SHA-256 f511b386b76b698b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 02:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d460a0870270fc7186f8067a7e34c44 SHA-1: d8332589b1b7251a35d57a6c0b36a2d1a4a9be43 SHA-256: f511b386b76b698b8a8e560b24d7aa3f93778403e20f9d5f598a4f22f1a09786
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=letter+s+worksheets+for+kindergarten+pdf PDF link annotation
    • http://erpsamik.com/ckfinder/userfiles/files/xisap.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/mokoxewaxun.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jubifoze.pdfIn PDF document text
    • http://esejsc.com/upload/files/45694227228.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8abfca2de---ninofajapapowi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7090ae5fa4---wojifivazerogim.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/dodoxuwotuvi.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/jegomefujupozisazosuluje.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/zexomokevoganafewumon.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210513232914.pdfIn PDF document text
    • http://imaginove.eu/data/Files/91528962759.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gm9vdrthh5h4mbep5obov3h47n/texatavanalavubozad.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/80463743219.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/7051056467.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/dadokafel.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/kijajosopabajimijipekeduv.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/72737567419.pdfIn PDF document text
    • http://tipiland.net/upload/file/pikoremaxawevozezufidek.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/57123905595.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dvb7ctnejtmn2lm7ct8k18n4c0/fotavakor.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/d393a2c26ce3e7f20b47e8aa9d5223bf/73447653337.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f2178d74---1641115272.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/60673784793.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/69310361391.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/87850756004.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_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 10868 bytes
SHA-256: 6eecc851d6e9a183b4c40831e61c87c032229afbe2cd78db1914a0bc98862a43
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 17500 bytes
SHA-256: b0d0506f5d9ce8cb654412d6a98935b8566d13aa1f5abab7694faf9eee970a38

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