Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b74114f6c37321…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 22:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a2f2cc8c2234e9cea1eda468f9bc0cc SHA-1: 9955f78b7d3625cc18d80dcfed9f78ea825fb9a1 SHA-256: c2b74114f6c3732170287ffe3871627a1909f48b167250a04f9593d9e3598d14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites or disposable domains. The embedded JavaScript stream and the ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) strongly indicate malicious intent, likely for phishing or malware delivery. The primary attack pattern involves luring users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5fe9829fc8f4648b906110723f9d83a0/guburafifi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6140034679---jepetobamedewizuj.pdf
    • https://plentis.eu/ckfinder/userfiles/files/losatotijibokexetoxonov.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m3amjqsufdtm2rndtvh2n8ve66/tiwazesefuxutuxofotari.pdf
    • http://mmckno2010.zkosuchdol.info/files/66501831076.pdf
    • http://rayer.cn/d/files/koxasipalomuf.pdf
    • https://muguet.fr/sites/default/files/file/kufumawudewadafudak.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/2nnd2lsjcn3dn33t5hgcbrklgk/36971495090.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4b0868ac9feda46d37c7e6e4d148bb26/54747986400.pdf
    • http://sloplast.com/userfiles/files/gurewimogeduzitefego.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/78168855909.pdf
    • http://vizit-k.net/uploads/editor/files/47478811695.pdf
    • http://stardentalcare.org/userfiles/file/nodojesudo.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523115730916086.pdf
    • http://signauction.net/userfiles/file/66507844393.pdf
    • http://locthanhroyal.com/upload/files/merov.pdf
    • http://harasim.cz/uploaded/files/murigizosipubilegupik.pdf
    • http://cnc-soustruzeni.cz/files/file/kovirosawebilis.pdf
    • http://lasfyy.com/uploadfile/file/20210531164125060.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/68e8da199b1423bed9adcbb7e72efbfe/pamiw.pdf
    • http://albarossa.jp/js/upload/files/kunavamavo.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1cc514d9188eccc3cde488558e815c4c/guxidiwuxoxutotinamiweme.pdf
    • http://baigeleather.com/userfiles/file/32864316352.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ea1f0b47---66593370074.pdf
    • http://faceconnects.com/ci/userfiles/files/45607369460.pdf
    • https://pcstaiwan.com/ckfinder/userfiles/files/jukukegowedaruki.pdf
    • http://kino-cosmik.ru/sadm_files/63684465968.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=greek+and+roman+gods+together+worksheet
    • 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_off0000db73.bin
2d46183f2eb0df6eb976d7fdbb6b4f013e5d5d6b543c3542870c6c68b4efb78d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 17292 bytes
font_01_sfnt_off0001078c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
font_02_sfnt_off00011fa3.bin
9af763a2080f3ecf6a2394b05811c19fc5590cafefd82b093b7aee16aaca6b20
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 10776 bytes