Malicious PDF — malware analysis report

Static analysis result for SHA-256 d271565ab4c2128b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 07:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfc91ccfbe89756622c8fc6578612232 SHA-1: e62b0260179a12d1e455c7135288786024baed5a SHA-256: d271565ab4c2128b73a175411a056a246466e87792fae330e9c6a2ee303cd048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://atdawnwelift.com/userfiles/file/rimofomamesoti.pdf
    • http://wonsakai.com/uploads/files/63290185477.pdf
    • http://ferien-in-zahren.de/images/file/35309863740.pdf
    • http://antoniolescio.net/userfiles/files/73709209209.pdf
    • http://ipceurope.be/assets/file/65976204786.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210910034600.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161354535ae7ae---382196049.pdf
    • http://klm-co.ru/foto/ck/files/tulizunizub.pdf
    • http://homeloanz.net/images/e/file/wowololadizogotamevog.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc6feb06b---8136156069.pdf
    • http://ptsound.com/plugins/ckfinder/userfiles/files/25944916797.pdf
    • http://occahomesearch.com/userfiles/files/20340866586.pdf
    • https://hockeymro.ca/docs/file/92121609204.pdf
    • https://er-cardiff.com/eurostyl/photos/file/xewazadewegiwusikot.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/jexakuvuni.pdf
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/60168161808.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd9ac0f2---16396937590.pdf
    • http://asu78.ru/userfiles/file/28553365580.pdf
    • http://lafenicealcamo.it/userfiles/files/14146626953.pdf
    • http://luatminhnghia.com/img/files/xibusipukorasofuv.pdf
    • http://www.jindatunnel.com/up_files/file/kirafe.pdf
    • https://pima-alarms.rs/slicice/file/mavodav.pdf
    • http://jsdarvin.com/files/34869447776.pdf
    • http://furniture83.com/upload/files/katozaditerape.pdf
    • https://aynadakikemalizm.com/resimler/files/saripopafob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nine+lives+full+movie+online+free
    • 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_off0000b266.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 16792 bytes
font_01_sfnt_off0000ca7d.bin
473a3451d50f77304f0682593b24aff1e57802315008fd9fba902477d39e1dac
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 10260 bytes
font_02_sfnt_off0000e184.bin
ca6b044a8baa6439626c9b22d43d66ec4cff3dbf96117031808f3a1956c69015
pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 14872 bytes