Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb99247c3e078f6d…

MALICIOUS

PDF

92.3 KB Created: 2021-09-14 06:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 656db5e43386a2adde4dbb16a2aae7a9 SHA-1: 97f25feb06fab048794bbdbac0d45facc803a618 SHA-256: fb99247c3e078f6dd250029bd5f82b3ece55b9aaaa9fdd8efd69b1bdae7a8c2a
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or credential harvesting attempt. The document's structure suggests it's a link farm designed to redirect users to compromised websites, likely to host further malicious content or phishing pages. The presence of heuristics related to MFA and password-protected archive lures strongly suggests the intent is to trick users into providing sensitive information or credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://allytemp.ru/uplcv?utm_term=biometric+in+android PDF link annotation
    • https://perfecthospitals.org/FCKeditor/file/jodulozosobomipe.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/5399636492.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/68074349625.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/28810645541.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/72257250713.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/ganiguma.pdfIn PDF document text
    • http://elskenecologie.nl/files/32943692324.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/jikonudajotulerer.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/94637640542.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/suwefarubolepeboxuwog.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/sibajujidonimoxogezizoviz.pdfIn PDF document text
    • https://asiapharma.la/files/files/weladosuxix.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uhjp136uhmviaiq8gunsbodk7c/fajilo.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/45494228.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/gemijonij.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/92589574011.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/kebom.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613407ba17a1b---rosaj.pdfIn PDF document text
    • http://fedime.org/imagenes/jepanakijisuli.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dqj8kho67ttvd4j5bpfibdhkhk/52471611474.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3961d984e09b4ca95bf0f33d1088e929/mapejunelemafow.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/nasoxomitam.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wolawinajebagatuxijese.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_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 18552 bytes
SHA-256: f65eaf1e35e8d1a1c759d9cdc2e5f4d4e569fc9cc712fd55b20038db01d729fa
font_01_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C62 10368 bytes
SHA-256: ae0174349801c019e2c7d6c5a02f5a3b1e30c1fa42299b7649855be1746897d9

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