Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4375c714cdc631f…

MALICIOUS

PDF

79.4 KB Created: 2021-08-17 20:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a612056de8edce3b46be4690ea44de3 SHA-1: 09f526ada9a720851faa81e921900853d134e831 SHA-256: b4375c714cdc631f13a1ec09ab588c9dc5fefa773be85f964bb0b9da6a806341
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to various websites, some of which appear to be compromised CMS uploads, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 http://kondicionery-ivanteevka.ru/upload_picture/file/44951730796.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be01c3de941---34761350799.pdf
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/46912817885.pdf
    • http://bbfederico2.net/userfiles/file/25863981129.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b27b6d4c74b5c2ee1584a4fe6526523a/zogaxexefupokodu.pdf
    • http://hotararicedo.ro/files/files/wudadedefa.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iaf6e5a574ek2f80n9fjtdvs8o/ravubevi.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/93qc3uf7ek6fg4h7dg5efbc0ur/19989072412.pdf
    • https://cissud.eu/uploads/ck_editor/files/tolatekoxipojokoxegen.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6i67nkj1ncr2ql453cjnoncr78/58954111070.pdf
    • http://omegapizza.net/uploads/files/gajojat.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/28b5f1a1d04641513438c33eb65233df/tebawidotaxalurobuzoxapu.pdf
    • https://nocenzura.space/web/img/podborky/files/27645957483.pdf
    • https://alexandrapanayotou.com/web/images/static/file/fobeb.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e75d1adfe---18902336499.pdf
    • https://cafesca.info/ckfinder/userfiles/files/vejawewilemizekanozox.pdf
    • http://vom-ragnaroek.de/uploads/file/galijegibej.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/70mi6n4p9bsu8dl6nsdtl2sapa/96415784382.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/73109424098.pdf
    • https://questyme.ca/userfiles/file/nezuz.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210817_C45A53E24A58A801.pdf
    • https://sitycare.com/FCK-UserFiles/files/vutofabekudobokamemem.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4b508046bbd189d5f629c8ad49a8400a/waxifereb.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0f6a9367b4790dbf7b7fb68296452aaf/tibumodexiwijijiwezog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=partituras+ejercicios+para+piano+principiantes
    • 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_off0000d68b.bin
bf9ab11476de6f8c933aa7eaafd570a9ddc61d8d99568214785ddded2442c2a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 16308 bytes
font_01_sfnt_off0000ff8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 16792 bytes
font_02_sfnt_off000117a3.bin
7bd6e72c0f3d97a50bf195fd1435b584236195d085956a4f39d77cd6f47f6676
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 10552 bytes