Malicious PDF — malware analysis report

Static analysis result for SHA-256 a606a33d2e093232…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 04:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 163c4a1884879e9615ce6e6150ae1b13 SHA-1: fe0532fc249d8ac56f135d370a64d52a52124cb7 SHA-256: a606a33d2e0932329007634c61eadebe7c7611e32898a19389342c95b23bfe4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0b0387d3c---99334599194.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/vateradezavisabapa.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/4c40f76f5f9176830d81e872802070a6/fawogavuvujavolawulowox.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/ranuk.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/38509063635.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/devipot.pdfIn PDF document text
    • http://kccmaul.com/files/files/21034879759.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/lirojunajobedabidimara.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160769323103d0---xegolufelevitubozesi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/b9essgoh9jqsa6e89qjp3smrm9/jamezoruvelutaralubivaf.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/gifuvukewulusitudeti.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/30769908077.pdfIn PDF document text
    • http://fructusartis.com/i/File/12244938829.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/bumarenul.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2615f83427---sonibod.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/jovowapugosaxobejewu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/43nj6nvdvjirce8hshe3ea1tne/370957196.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/36683998141.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/tifijidiwovibejisedozulot.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e2b96a1a---16837946929.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/7650527199.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/galinezujifetokovud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=identifying+narrative+perspective+worksheet+answersPDF 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_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 11160 bytes
SHA-256: 5fda5cfc062d84c09117a336a9c0fbdb5c0d83f664c79afaceaedffcfb458e24
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 18248 bytes
SHA-256: 5666b36be0c5fa6b0047c928564610b8b71013df843808da2ec6813575415dea
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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