Malicious PDF — malware analysis report

Static analysis result for SHA-256 487e781f127dfe59…

MALICIOUS

PDF

94.4 KB Created: 2021-08-06 16:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ea6caaae65930e743bd72c4c23148d0 SHA-1: 26cd48ec8e4899f008b94772ff33171ba2c66498 SHA-256: 487e781f127dfe5980e44c545cca4668c17d14ede0c7e1e051419bef062d9914
164 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, aiming to trick users into clicking links that likely lead to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://blv.by/upload/editor/files/zewefexogulave.pdf In PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/74069433331.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/32651133161.pdfIn PDF document text
    • http://kd-council.com/upfile/files/55122186633.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e7t8scrs6q3ubrej0ge77s6n96/wipatosenineletafa.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/65892116132.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/tefedev.pdfIn PDF document text
    • https://numberonerevolution.it/file/nibarekomubiwofunewedoko.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2218c5054a---wefupuguvoxarimoledo.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/55349877961.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5e49ee1fcb385527444cfdf464e44468/88977320354.pdfIn PDF document text
    • http://axwelindia.com/uploads/xedusev.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lv8a2f6al31d3dts4vbhhjumvj/keveridunuba.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/pimixagesebolebixosemuf.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/1046286903.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/getafuvuzekajaremex.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/kakinexepenororotuxawut.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/6igtkuco3jb080o2ltgg3klmfl/69969549713.pdfIn PDF document text
    • https://noddy.nu/images/file/lojixofarijujifozife.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/95abe4da3763d1bb0de353e00011768d/nelowajutana.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/godorobekevan.pdfIn PDF document text
    • http://sy-smile.com/upload/files/ladokavin.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/02qnstu8ap4k1bh89asv56e5o1/73694366204.pdfIn PDF document text
    • http://heizler.hu/files/file/joratafuxovi.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wufofoxogimokutome.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/90130942696.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/38918285294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+driver+scanner+brother+dcp+t500wPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 2688 bytes
SHA-256: a2ac081e08affb0ecf0a940f0eec8b4be73ee6624f5ae6ef3b741cdea718dd26
font_02_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 20908 bytes
SHA-256: 2ff93099bdb282cf4759b49929a9a468eb44b99baaf283ea0e7034018a43d26c
font_04_sfnt_off00014f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F10 11160 bytes
SHA-256: 6e9019731e619a7a752bc5bb0b853077347d318e4d2382b49fb46b5ae05b4019

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