Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b86a56c890a9a18…

MALICIOUS

PDF

175.5 KB Created: 2021-06-25 16:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b6de13514b771588ae2b98b638da378 SHA-1: af7f18220251bb1d6e5e02ef1d61deedf88631c7 SHA-256: 3b86a56c890a9a18eb0d49ca2c8cba426c2174befbfb8cae8b9b8f197f725e34
336 Risk Score

Malware Insights

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

This PDF document exhibits multiple social engineering lures, including a browser update installation pretext and a direct request for recovery secrets. The presence of numerous links to compromised WordPress sites and disposable hosting suggests an attempt to distribute malicious payloads or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 11

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://philabc.ru/uplcv?utm_term=update+to+windows+10+from+windows+8.1
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bab8c874740cf15c678798b592569651/zitaxorirogowetob.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/cc97187acecd5c15f49e6d5fa9bd2b12/gowukotijarulorugad.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800571b647---juwofaxukeraliso.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8087f695---93450424879.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe6425b6a---dogit.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2aa579ba---nudomibawunef.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7af346158---70040799904.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609570e4147e3---28341345157.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6710a162a---redibilojekofa.pdf
    • http://119hero.kr/userData/board/file/jededixejijinalemupuzeze.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/339c588940f6196f9562507127474952/xukufizinorewaluzuniw.pdf
    • https://burgas-remonti.com/userfiles/file/59092422378.pdf
    • http://www.findvoters.com/userfiles/file/mugikalowaga.pdf
    • http://fresh-j.info/images/uploadedimages/file/82687031837.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b7271a46e0cedc83e76359e1c36cab43/17223627988.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b70003eb06a---monavuxogemepetakonaku.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_off00025024.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25024 16792 bytes
font_01_sfnt_off0002683b.bin
b6ef2714e41731681aeabd2a806e1b3697637245bc455eed2b64b327d6ed4101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2683B 11156 bytes
font_02_sfnt_off0002826c.bin
15e4ee3eeb28157a3c4d1e81d5e470c347bf6589234c7d4692e7fd92583dbedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2826C 17724 bytes

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