Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f82330d29e4f6c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-20 09:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1e1deeb3d2bde80d965a9f729609550 SHA-1: f9047d48a4ff8cbd95e0de7812cd23e3a2c81881 SHA-256: b1f82330d29e4f6c13f0e2015632a4fde62d1170a3c8964abded59df9a976633
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a payload, a common tactic to evade static analysis. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://irlanc.ru/uplcv?utm_term=como+descobrir+senha+de+wi+fi+android PDF link annotation
    • http://hflbdq.com/uploads/file/040233316182.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/21260067973.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/14015292376.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322415efef9---joniwudisubilowebadenuja.pdfIn PDF document text
    • https://sambelteri.com/contents/files/50757671262.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/xidixu.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/88841711407.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/vulotovus.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/16077843022.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/kowanakowiz.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/xuvusatakuzupo.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/25358387908.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/17342246547.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/lilisixe.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/19147909730.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/lizukutadut.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/15338853385.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147ad96c1d24---66524243432.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f75075071---65111367788.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/rawuva.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/66449299360.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/70219919800.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/fezudogawibetategevamo.pdfIn PDF document text
    • https://unitjaya.com/contents/files/57231338886.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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 22260 bytes
SHA-256: 2712ba3e941c9d808070b95989a553fbf8ec79d0e141a272c7b36d51a95e59e3
font_02_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 10852 bytes
SHA-256: 4b4e8b32c531e04948f460ee98aea028a907cd920383cfedcff737dfc944ac9f

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